[LAU] Testing JACK and PA latency

Patrick Shirkey pshirkey at boosthardware.com
Thu Sep 19 11:04:03 UTC 2013
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On Thu, September 19, 2013 8:46 pm, Fons Adriaensen wrote:
> On Thu, Sep 19, 2013 at 08:04:04PM +1000, Patrick Shirkey wrote:
>
>> > 1. Measure the round-trip latency of your sound card (with an
>> > external analog loop).
>> >
>>
>> Can I use jack_delay running on a second computer connected to the
>> external i/o of the first computer to get this value?
>
> You'd measure something different...
>
> But you could use two computers as follows:
>
> A = computer with jack, PA, audacity
> B = second computer with sound card, jack and jack_delay.
>
> 1. Measure the round-trip latency on B, with an external
>    analog loop.
>
> 2. Connect B -> A, A -> B, run complete chain on A.
>
> 3. Measure again on B, subtract the value from (1).
>
>> >   jack_delay -> pa_source -> audacity -> pa_sink -> jack_delay.
>> >
>>
>> Does this look reasonable?
>>
>>   1023.978 frames     21.333 ms total roundtrip latency
>> 	extra loopback latency: 1023 frames
>> 	use 511 for the backend arguments -I and -O
>>   1023.976 frames     21.333 ms total roundtrip latency
>> 	extra loopback latency: 1023 frames
>> 	use 511 for the backend arguments -I and -O
>>   1023.977 frames     21.333 ms total roundtrip latency
>> 	extra loopback latency: 1023 frames
>> 	use 511 for the backend arguments -I and -O
>
> Don't know - I'm by no means a PA expert... and I don't know
> your Jack period size. Given PA's reputation I'd expect more:
> 1024 samples would mean that PA imposes almost the same RT-
> requirements on apps as Jack does, and it was designed *not*
> to do that...  But maybe the jack <-> PA interface doesn't
> use the same amount of buffering that PA normally adds.
>
> Note that the value measured is modulo 2^16 samples, but I
> wouldn't expect anything more than a second, so this probably
> irrelevant.
>

A bit more detail before I send this over to the PA guys for feedback. I
am seeing the time period returned by jack_delay regularly increase during
the measurement process. Do you have any thoughts on why that would be
happening? I would like to rule out jack_delay because this is most likely
a bug in PA that I have found.


I'm using this method:

jack is now set to 64/48000/2

This is the graph:

  jack_delay -> pa_source -> audacity -> pa_sink -> jack_delay

Using audacity with 0 internal latency and in pass through mode I see the
following results. It starts out as 10.667ms and after a few seconds it
climbs up to 70.667 ms.

I see similar results with ecasound instead of audacity using the
following graph and ecachain:

jack_delay -> pa_source -> ecasound -> pa_sink -> jack_delay

ecasound -f:32,2,48000 -b:64 -i alsa -o alsa

In that case it starts at 60.000 ms and climbs upto 572.000 ms after a few
seconds of running the test.


Audacity :
------------------

  512.003 frames     10.667 ms total roundtrip latency
	extra loopback latency: 512 frames
	use 256 for the backend arguments -I and -O
   512.008 frames     10.667 ms total roundtrip latency
	extra loopback latency: 512 frames
	use 256 for the backend arguments -I and -O
   512.006 frames     10.667 ms total roundtrip latency
	extra loopback latency: 512 frames
	use 256 for the backend arguments -I and -O
  1600.006 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.006 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.006 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.334 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.008 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  1600.007 frames     33.333 ms total roundtrip latency
	extra loopback latency: 1600 frames
	use 800 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.008 frames     49.334 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.008 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2368.007 frames     49.333 ms total roundtrip latency
	extra loopback latency: 2368 frames
	use 1184 for the backend arguments -I and -O
  2432.008 frames     50.667 ms total roundtrip latency
	extra loopback latency: 2432 frames
	use 1216 for the backend arguments -I and -O
  2432.008 frames     50.667 ms total roundtrip latency
	extra loopback latency: 2432 frames
	use 1216 for the backend arguments -I and -O
  2432.008 frames     50.667 ms total roundtrip latency
	extra loopback latency: 2432 frames
	use 1216 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.007 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.009 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.007 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.007 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.007 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.008 frames     53.334 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  2560.007 frames     53.333 ms total roundtrip latency
	extra loopback latency: 2560 frames
	use 1280 for the backend arguments -I and -O
  3136.008 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.007 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.007 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.007 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.007 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.007 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.007 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.008 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3136.009 frames     65.334 ms total roundtrip latency
	extra loopback latency: 3136 frames
	use 1568 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.009 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.007 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.007 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.008 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.009 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.009 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O
  3392.009 frames     70.667 ms total roundtrip latency
	extra loopback latency: 3392 frames
	use 1696 for the backend arguments -I and -O

------------------


Ecasound

ecasound -f:32,2,48000 -b:64 -i alsa -o alsa


------------------




 2880.006 frames     60.000 ms total roundtrip latency
	extra loopback latency: 2880 frames
	use 1440 for the backend arguments -I and -O
  2879.998 frames     60.000 ms total roundtrip latency
	extra loopback latency: 2879 frames
	use 1439 for the backend arguments -I and -O
  2879.998 frames     60.000 ms total roundtrip latency
	extra loopback latency: 2879 frames
	use 1439 for the backend arguments -I and -O
  2879.998 frames     60.000 ms total roundtrip latency
	extra loopback latency: 2879 frames
	use 1439 for the backend arguments -I and -O
  3135.997 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3135 frames
	use 1567 for the backend arguments -I and -O ??
  3135.995 frames     65.333 ms total roundtrip latency
	extra loopback latency: 3135 frames
	use 1567 for the backend arguments -I and -O
  6847.998 frames    142.667 ms total roundtrip latency
	extra loopback latency: 6847 frames
	use 3423 for the backend arguments -I and -O
  7167.996 frames    149.333 ms total roundtrip latency
	extra loopback latency: 7167 frames
	use 3583 for the backend arguments -I and -O
  7167.999 frames    149.333 ms total roundtrip latency
	extra loopback latency: 7167 frames
	use 3583 for the backend arguments -I and -O
  7167.997 frames    149.333 ms total roundtrip latency
	extra loopback latency: 7167 frames
	use 3583 for the backend arguments -I and -O
  7167.998 frames    149.333 ms total roundtrip latency
	extra loopback latency: 7167 frames
	use 3583 for the backend arguments -I and -O
  7167.998 frames    149.333 ms total roundtrip latency
	extra loopback latency: 7167 frames
	use 3583 for the backend arguments -I and -O
  7231.998 frames    150.667 ms total roundtrip latency
	extra loopback latency: 7231 frames
	use 3615 for the backend arguments -I and -O
  7231.998 frames    150.667 ms total roundtrip latency
	extra loopback latency: 7231 frames
	use 3615 for the backend arguments -I and -O
  8575.996 frames    178.667 ms total roundtrip latency
	extra loopback latency: 8575 frames
	use 4287 for the backend arguments -I and -O
  8575.998 frames    178.667 ms total roundtrip latency
	extra loopback latency: 8575 frames
	use 4287 for the backend arguments -I and -O
  8575.997 frames    178.667 ms total roundtrip latency
	extra loopback latency: 8575 frames
	use 4287 for the backend arguments -I and -O
  8575.998 frames    178.667 ms total roundtrip latency
	extra loopback latency: 8575 frames
	use 4287 for the backend arguments -I and -O
  8959.996 frames    186.667 ms total roundtrip latency
	extra loopback latency: 8959 frames
	use 4479 for the backend arguments -I and -O ??
  8959.996 frames    186.667 ms total roundtrip latency
	extra loopback latency: 8959 frames
	use 4479 for the backend arguments -I and -O
 13760.002 frames    286.667 ms total roundtrip latency
	extra loopback latency: 13760 frames
	use 6880 for the backend arguments -I and -O
 14592.000 frames    304.000 ms total roundtrip latency
	extra loopback latency: 14592 frames
	use 7296 for the backend arguments -I and -O
 14591.999 frames    304.000 ms total roundtrip latency
	extra loopback latency: 14591 frames
	use 7295 for the backend arguments -I and -O
 14591.998 frames    304.000 ms total roundtrip latency
	extra loopback latency: 14591 frames
	use 7295 for the backend arguments -I and -O
 14591.998 frames    304.000 ms total roundtrip latency
	extra loopback latency: 14591 frames
	use 7295 for the backend arguments -I and -O
 14591.998 frames    304.000 ms total roundtrip latency
	extra loopback latency: 14591 frames
	use 7295 for the backend arguments -I and -O
 14592.000 frames    304.000 ms total roundtrip latency
	extra loopback latency: 14591 frames
	use 7295 for the backend arguments -I and -O
 16191.999 frames    337.333 ms total roundtrip latency
	extra loopback latency: 16191 frames
	use 8095 for the backend arguments -I and -O
 16191.998 frames    337.333 ms total roundtrip latency
	extra loopback latency: 16191 frames
	use 8095 for the backend arguments -I and -O
 16191.998 frames    337.333 ms total roundtrip latency
	extra loopback latency: 16191 frames
	use 8095 for the backend arguments -I and -O
 16191.998 frames    337.333 ms total roundtrip latency
	extra loopback latency: 16191 frames
	use 8095 for the backend arguments -I and -O
 16255.998 frames    338.667 ms total roundtrip latency
	extra loopback latency: 16255 frames
	use 8127 for the backend arguments -I and -O
 16255.998 frames    338.667 ms total roundtrip latency
	extra loopback latency: 16255 frames
	use 8127 for the backend arguments -I and -O
 16255.998 frames    338.667 ms total roundtrip latency
	extra loopback latency: 16255 frames
	use 8127 for the backend arguments -I and -O
 16255.999 frames    338.667 ms total roundtrip latency
	extra loopback latency: 16255 frames
	use 8127 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.999 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.997 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.999 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16319.998 frames    340.000 ms total roundtrip latency
	extra loopback latency: 16319 frames
	use 8159 for the backend arguments -I and -O
 16447.998 frames    342.667 ms total roundtrip latency
	extra loopback latency: 16447 frames
	use 8223 for the backend arguments -I and -O
 16447.997 frames    342.667 ms total roundtrip latency
	extra loopback latency: 16447 frames
	use 8223 for the backend arguments -I and -O
 16447.998 frames    342.667 ms total roundtrip latency
	extra loopback latency: 16447 frames
	use 8223 for the backend arguments -I and -O
 16447.999 frames    342.667 ms total roundtrip latency
	extra loopback latency: 16447 frames
	use 8223 for the backend arguments -I and -O
 16447.999 frames    342.667 ms total roundtrip latency
	extra loopback latency: 16447 frames
	use 8223 for the backend arguments -I and -O
 16575.998 frames    345.333 ms total roundtrip latency
	extra loopback latency: 16575 frames
	use 8287 for the backend arguments -I and -O
 16575.998 frames    345.333 ms total roundtrip latency
	extra loopback latency: 16575 frames
	use 8287 for the backend arguments -I and -O
 16575.998 frames    345.333 ms total roundtrip latency
	extra loopback latency: 16575 frames
	use 8287 for the backend arguments -I and -O
 16575.998 frames    345.333 ms total roundtrip latency
	extra loopback latency: 16575 frames
	use 8287 for the backend arguments -I and -O
 16639.999 frames    346.667 ms total roundtrip latency
	extra loopback latency: 16639 frames
	use 8319 for the backend arguments -I and -O
 16639.998 frames    346.667 ms total roundtrip latency
	extra loopback latency: 16639 frames
	use 8319 for the backend arguments -I and -O
 16639.998 frames    346.667 ms total roundtrip latency
	extra loopback latency: 16639 frames
	use 8319 for the backend arguments -I and -O
 16703.999 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16703.998 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16703.999 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16703.997 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16703.997 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16703.998 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16703.998 frames    348.000 ms total roundtrip latency
	extra loopback latency: 16703 frames
	use 8351 for the backend arguments -I and -O
 16767.997 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.997 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.998 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16767.997 frames    349.333 ms total roundtrip latency
	extra loopback latency: 16767 frames
	use 8383 for the backend arguments -I and -O
 16895.997 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.997 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.997 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.997 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.999 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.999 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.998 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16895.997 frames    352.000 ms total roundtrip latency
	extra loopback latency: 16895 frames
	use 8447 for the backend arguments -I and -O
 16959.998 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.997 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.998 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.998 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.997 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.998 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.999 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.999 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.998 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.997 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 16959.997 frames    353.333 ms total roundtrip latency
	extra loopback latency: 16959 frames
	use 8479 for the backend arguments -I and -O
 17087.998 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17087.998 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17087.997 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17087.997 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17087.997 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17087.998 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17087.998 frames    356.000 ms total roundtrip latency
	extra loopback latency: 17087 frames
	use 8543 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.997 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.997 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.997 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.997 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.999 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17151.998 frames    357.333 ms total roundtrip latency
	extra loopback latency: 17151 frames
	use 8575 for the backend arguments -I and -O
 17215.999 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.999 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.998 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.998 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.997 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.997 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.998 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17215.998 frames    358.667 ms total roundtrip latency
	extra loopback latency: 17215 frames
	use 8607 for the backend arguments -I and -O
 17343.998 frames    361.333 ms total roundtrip latency
	extra loopback latency: 17343 frames
	use 8671 for the backend arguments -I and -O
 17343.998 frames    361.333 ms total roundtrip latency
	extra loopback latency: 17343 frames
	use 8671 for the backend arguments -I and -O
 17407.998 frames    362.667 ms total roundtrip latency
	extra loopback latency: 17407 frames
	use 8703 for the backend arguments -I and -O
 17407.998 frames    362.667 ms total roundtrip latency
	extra loopback latency: 17407 frames
	use 8703 for the backend arguments -I and -O
 17471.999 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.997 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.998 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.998 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.998 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.998 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.997 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.998 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17471.999 frames    364.000 ms total roundtrip latency
	extra loopback latency: 17471 frames
	use 8735 for the backend arguments -I and -O
 17599.998 frames    366.667 ms total roundtrip latency
	extra loopback latency: 17599 frames
	use 8799 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.997 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.997 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.997 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.999 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.999 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.999 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.997 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17663.998 frames    368.000 ms total roundtrip latency
	extra loopback latency: 17663 frames
	use 8831 for the backend arguments -I and -O
 17791.999 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.999 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.999 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.997 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.997 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.997 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.997 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.997 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.997 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.998 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17791.999 frames    370.667 ms total roundtrip latency
	extra loopback latency: 17791 frames
	use 8895 for the backend arguments -I and -O
 17855.998 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17855.998 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17855.999 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17855.999 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17855.999 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17855.999 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17856.000 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17855 frames
	use 8927 for the backend arguments -I and -O
 17856.001 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17856 frames
	use 8928 for the backend arguments -I and -O
 17856.001 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17856 frames
	use 8928 for the backend arguments -I and -O
 17856.001 frames    372.000 ms total roundtrip latency
	extra loopback latency: 17856 frames
	use 8928 for the backend arguments -I and -O
 17984.003 frames    374.667 ms total roundtrip latency
	extra loopback latency: 17984 frames
	use 8992 for the backend arguments -I and -O
 18112.005 frames    377.333 ms total roundtrip latency
	extra loopback latency: 18112 frames
	use 9056 for the backend arguments -I and -O
 18112.003 frames    377.333 ms total roundtrip latency
	extra loopback latency: 18112 frames
	use 9056 for the backend arguments -I and -O
 18112.001 frames    377.333 ms total roundtrip latency
	extra loopback latency: 18112 frames
	use 9056 for the backend arguments -I and -O
 18176.003 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18176.006 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18176.005 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18176.005 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18176.006 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18176.007 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18176.003 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18176 frames
	use 9088 for the backend arguments -I and -O
 18175.999 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.993 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.991 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.992 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.992 frames    378.667 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.990 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.988 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.987 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.985 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.987 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.987 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.988 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.988 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.988 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.988 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18175.987 frames    378.666 ms total roundtrip latency
	extra loopback latency: 18175 frames
	use 9087 for the backend arguments -I and -O
 18239.989 frames    380.000 ms total roundtrip latency
	extra loopback latency: 18239 frames
	use 9119 for the backend arguments -I and -O
 18239.989 frames    380.000 ms total roundtrip latency
	extra loopback latency: 18239 frames
	use 9119 for the backend arguments -I and -O
 18303.987 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.989 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.988 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.987 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.987 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.988 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.989 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.988 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.990 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.989 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.989 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18303.989 frames    381.333 ms total roundtrip latency
	extra loopback latency: 18303 frames
	use 9151 for the backend arguments -I and -O
 18431.989 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.987 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.989 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.987 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.987 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.987 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.988 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.988 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.988 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.988 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18431.988 frames    384.000 ms total roundtrip latency
	extra loopback latency: 18431 frames
	use 9215 for the backend arguments -I and -O
 18815.988 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O ??
 18815.989 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.988 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.987 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.988 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.988 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.990 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.990 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.990 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.992 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.992 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.990 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.987 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.986 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18815.988 frames    392.000 ms total roundtrip latency
	extra loopback latency: 18815 frames
	use 9407 for the backend arguments -I and -O
 18943.988 frames    394.666 ms total roundtrip latency
	extra loopback latency: 18943 frames
	use 9471 for the backend arguments -I and -O
 18943.989 frames    394.666 ms total roundtrip latency
	extra loopback latency: 18943 frames
	use 9471 for the backend arguments -I and -O
 18943.988 frames    394.666 ms total roundtrip latency
	extra loopback latency: 18943 frames
	use 9471 for the backend arguments -I and -O
 18943.985 frames    394.666 ms total roundtrip latency
	extra loopback latency: 18943 frames
	use 9471 for the backend arguments -I and -O
 18943.989 frames    394.666 ms total roundtrip latency
	extra loopback latency: 18943 frames
	use 9471 for the backend arguments -I and -O
 18943.988 frames    394.666 ms total roundtrip latency
	extra loopback latency: 18943 frames
	use 9471 for the backend arguments -I and -O
 19007.987 frames    396.000 ms total roundtrip latency
	extra loopback latency: 19007 frames
	use 9503 for the backend arguments -I and -O
 19007.988 frames    396.000 ms total roundtrip latency
	extra loopback latency: 19007 frames
	use 9503 for the backend arguments -I and -O
 19007.989 frames    396.000 ms total roundtrip latency
	extra loopback latency: 19007 frames
	use 9503 for the backend arguments -I and -O
 19007.989 frames    396.000 ms total roundtrip latency
	extra loopback latency: 19007 frames
	use 9503 for the backend arguments -I and -O
 19007.993 frames    396.000 ms total roundtrip latency
	extra loopback latency: 19007 frames
	use 9503 for the backend arguments -I and -O
 19007.989 frames    396.000 ms total roundtrip latency
	extra loopback latency: 19007 frames
	use 9503 for the backend arguments -I and -O
 19071.986 frames    397.333 ms total roundtrip latency
	extra loopback latency: 19071 frames
	use 9535 for the backend arguments -I and -O
 19071.988 frames    397.333 ms total roundtrip latency
	extra loopback latency: 19071 frames
	use 9535 for the backend arguments -I and -O
 19199.985 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.988 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.988 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.988 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.988 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.988 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.985 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.984 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19199.987 frames    400.000 ms total roundtrip latency
	extra loopback latency: 19199 frames
	use 9599 for the backend arguments -I and -O
 19519.986 frames    406.666 ms total roundtrip latency
	extra loopback latency: 19519 frames
	use 9759 for the backend arguments -I and -O
 19519.988 frames    406.666 ms total roundtrip latency
	extra loopback latency: 19519 frames
	use 9759 for the backend arguments -I and -O
 19519.988 frames    406.666 ms total roundtrip latency
	extra loopback latency: 19519 frames
	use 9759 for the backend arguments -I and -O
 19519.990 frames    406.666 ms total roundtrip latency
	extra loopback latency: 19519 frames
	use 9759 for the backend arguments -I and -O
 19519.991 frames    406.666 ms total roundtrip latency
	extra loopback latency: 19519 frames
	use 9759 for the backend arguments -I and -O
 19839.989 frames    413.333 ms total roundtrip latency
	extra loopback latency: 19839 frames
	use 9919 for the backend arguments -I and -O
 19839.987 frames    413.333 ms total roundtrip latency
	extra loopback latency: 19839 frames
	use 9919 for the backend arguments -I and -O
 21823.985 frames    454.666 ms total roundtrip latency
	extra loopback latency: 21823 frames
	use 10911 for the backend arguments -I and -O
 22655.986 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.984 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.987 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.987 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.987 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.987 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.989 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.988 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22655.991 frames    472.000 ms total roundtrip latency
	extra loopback latency: 22655 frames
	use 11327 for the backend arguments -I and -O
 22719.989 frames    473.333 ms total roundtrip latency
	extra loopback latency: 22719 frames
	use 11359 for the backend arguments -I and -O
 22783.988 frames    474.666 ms total roundtrip latency
	extra loopback latency: 22783 frames
	use 11391 for the backend arguments -I and -O
 22783.987 frames    474.666 ms total roundtrip latency
	extra loopback latency: 22783 frames
	use 11391 for the backend arguments -I and -O
 22783.987 frames    474.666 ms total roundtrip latency
	extra loopback latency: 22783 frames
	use 11391 for the backend arguments -I and -O
 23039.987 frames    480.000 ms total roundtrip latency
	extra loopback latency: 23039 frames
	use 11519 for the backend arguments -I and -O
 23039.987 frames    480.000 ms total roundtrip latency
	extra loopback latency: 23039 frames
	use 11519 for the backend arguments -I and -O
 23039.987 frames    480.000 ms total roundtrip latency
	extra loopback latency: 23039 frames
	use 11519 for the backend arguments -I and -O
 23103.988 frames    481.333 ms total roundtrip latency
	extra loopback latency: 23103 frames
	use 11551 for the backend arguments -I and -O
 23103.989 frames    481.333 ms total roundtrip latency
	extra loopback latency: 23103 frames
	use 11551 for the backend arguments -I and -O
 23103.989 frames    481.333 ms total roundtrip latency
	extra loopback latency: 23103 frames
	use 11551 for the backend arguments -I and -O
 23231.988 frames    484.000 ms total roundtrip latency
	extra loopback latency: 23231 frames
	use 11615 for the backend arguments -I and -O
 23231.987 frames    484.000 ms total roundtrip latency
	extra loopback latency: 23231 frames
	use 11615 for the backend arguments -I and -O
 23231.987 frames    484.000 ms total roundtrip latency
	extra loopback latency: 23231 frames
	use 11615 for the backend arguments -I and -O
 23359.986 frames    486.666 ms total roundtrip latency
	extra loopback latency: 23359 frames
	use 11679 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.989 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.987 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.987 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.987 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.987 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.987 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.986 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.987 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23423.988 frames    488.000 ms total roundtrip latency
	extra loopback latency: 23423 frames
	use 11711 for the backend arguments -I and -O
 23487.988 frames    489.333 ms total roundtrip latency
	extra loopback latency: 23487 frames
	use 11743 for the backend arguments -I and -O
 23487.989 frames    489.333 ms total roundtrip latency
	extra loopback latency: 23487 frames
	use 11743 for the backend arguments -I and -O
 23487.988 frames    489.333 ms total roundtrip latency
	extra loopback latency: 23487 frames
	use 11743 for the backend arguments -I and -O
 23487.988 frames    489.333 ms total roundtrip latency
	extra loopback latency: 23487 frames
	use 11743 for the backend arguments -I and -O
 23615.987 frames    492.000 ms total roundtrip latency
	extra loopback latency: 23615 frames
	use 11807 for the backend arguments -I and -O
 23615.987 frames    492.000 ms total roundtrip latency
	extra loopback latency: 23615 frames
	use 11807 for the backend arguments -I and -O
 23615.986 frames    492.000 ms total roundtrip latency
	extra loopback latency: 23615 frames
	use 11807 for the backend arguments -I and -O
 23679.986 frames    493.333 ms total roundtrip latency
	extra loopback latency: 23679 frames
	use 11839 for the backend arguments -I and -O
 23679.987 frames    493.333 ms total roundtrip latency
	extra loopback latency: 23679 frames
	use 11839 for the backend arguments -I and -O
 23743.987 frames    494.666 ms total roundtrip latency
	extra loopback latency: 23743 frames
	use 11871 for the backend arguments -I and -O
 23743.987 frames    494.666 ms total roundtrip latency
	extra loopback latency: 23743 frames
	use 11871 for the backend arguments -I and -O
 23743.988 frames    494.666 ms total roundtrip latency
	extra loopback latency: 23743 frames
	use 11871 for the backend arguments -I and -O
 23743.988 frames    494.666 ms total roundtrip latency
	extra loopback latency: 23743 frames
	use 11871 for the backend arguments -I and -O
 23871.991 frames    497.333 ms total roundtrip latency
	extra loopback latency: 23871 frames
	use 11935 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.988 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 23935.987 frames    498.666 ms total roundtrip latency
	extra loopback latency: 23935 frames
	use 11967 for the backend arguments -I and -O
 24255.988 frames    505.333 ms total roundtrip latency
	extra loopback latency: 24255 frames
	use 12127 for the backend arguments -I and -O
 24255.987 frames    505.333 ms total roundtrip latency
	extra loopback latency: 24255 frames
	use 12127 for the backend arguments -I and -O
 24255.987 frames    505.333 ms total roundtrip latency
	extra loopback latency: 24255 frames
	use 12127 for the backend arguments -I and -O
 24255.987 frames    505.333 ms total roundtrip latency
	extra loopback latency: 24255 frames
	use 12127 for the backend arguments -I and -O
 24319.987 frames    506.666 ms total roundtrip latency
	extra loopback latency: 24319 frames
	use 12159 for the backend arguments -I and -O
 24319.987 frames    506.666 ms total roundtrip latency
	extra loopback latency: 24319 frames
	use 12159 for the backend arguments -I and -O
 24319.987 frames    506.666 ms total roundtrip latency
	extra loopback latency: 24319 frames
	use 12159 for the backend arguments -I and -O
 24383.988 frames    508.000 ms total roundtrip latency
	extra loopback latency: 24383 frames
	use 12191 for the backend arguments -I and -O
 24383.989 frames    508.000 ms total roundtrip latency
	extra loopback latency: 24383 frames
	use 12191 for the backend arguments -I and -O
 24447.990 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.989 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.988 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.988 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.988 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.988 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.987 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.985 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.987 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.988 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24447.988 frames    509.333 ms total roundtrip latency
	extra loopback latency: 24447 frames
	use 12223 for the backend arguments -I and -O
 24639.989 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.988 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.989 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.988 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.987 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.987 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.987 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.988 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24639.987 frames    513.333 ms total roundtrip latency
	extra loopback latency: 24639 frames
	use 12319 for the backend arguments -I and -O
 24831.990 frames    517.333 ms total roundtrip latency
	extra loopback latency: 24831 frames
	use 12415 for the backend arguments -I and -O
 24831.988 frames    517.333 ms total roundtrip latency
	extra loopback latency: 24831 frames
	use 12415 for the backend arguments -I and -O
 24831.988 frames    517.333 ms total roundtrip latency
	extra loopback latency: 24831 frames
	use 12415 for the backend arguments -I and -O
 24959.989 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.988 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.988 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.988 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.988 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.988 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.987 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 24959.987 frames    520.000 ms total roundtrip latency
	extra loopback latency: 24959 frames
	use 12479 for the backend arguments -I and -O
 25151.987 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25151.988 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25151.990 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25151.990 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25151.990 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25151.988 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25151.989 frames    524.000 ms total roundtrip latency
	extra loopback latency: 25151 frames
	use 12575 for the backend arguments -I and -O
 25343.988 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.988 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.988 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.988 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.988 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.988 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.989 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.989 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.989 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.991 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.994 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.997 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25343.997 frames    528.000 ms total roundtrip latency
	extra loopback latency: 25343 frames
	use 12671 for the backend arguments -I and -O
 25471.996 frames    530.667 ms total roundtrip latency
	extra loopback latency: 25471 frames
	use 12735 for the backend arguments -I and -O
 25471.995 frames    530.667 ms total roundtrip latency
	extra loopback latency: 25471 frames
	use 12735 for the backend arguments -I and -O
 25471.993 frames    530.667 ms total roundtrip latency
	extra loopback latency: 25471 frames
	use 12735 for the backend arguments -I and -O
 25471.993 frames    530.667 ms total roundtrip latency
	extra loopback latency: 25471 frames
	use 12735 for the backend arguments -I and -O
 25471.993 frames    530.667 ms total roundtrip latency
	extra loopback latency: 25471 frames
	use 12735 for the backend arguments -I and -O
 25535.993 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.994 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.995 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.994 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.993 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.992 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.992 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.993 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.993 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.993 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25535.993 frames    532.000 ms total roundtrip latency
	extra loopback latency: 25535 frames
	use 12767 for the backend arguments -I and -O
 25727.994 frames    536.000 ms total roundtrip latency
	extra loopback latency: 25727 frames
	use 12863 for the backend arguments -I and -O
 25727.994 frames    536.000 ms total roundtrip latency
	extra loopback latency: 25727 frames
	use 12863 for the backend arguments -I and -O
 25727.991 frames    536.000 ms total roundtrip latency
	extra loopback latency: 25727 frames
	use 12863 for the backend arguments -I and -O
 25727.993 frames    536.000 ms total roundtrip latency
	extra loopback latency: 25727 frames
	use 12863 for the backend arguments -I and -O
 26175.993 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.994 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.994 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.994 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.993 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.993 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.993 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.991 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.991 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.991 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.991 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.991 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.992 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26175.992 frames    545.333 ms total roundtrip latency
	extra loopback latency: 26175 frames
	use 13087 for the backend arguments -I and -O
 26239.993 frames    546.667 ms total roundtrip latency
	extra loopback latency: 26239 frames
	use 13119 for the backend arguments -I and -O
 26239.993 frames    546.667 ms total roundtrip latency
	extra loopback latency: 26239 frames
	use 13119 for the backend arguments -I and -O
 26303.993 frames    548.000 ms total roundtrip latency
	extra loopback latency: 26303 frames
	use 13151 for the backend arguments -I and -O
 26303.992 frames    548.000 ms total roundtrip latency
	extra loopback latency: 26303 frames
	use 13151 for the backend arguments -I and -O
 26303.992 frames    548.000 ms total roundtrip latency
	extra loopback latency: 26303 frames
	use 13151 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.990 frames    550.666 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26431.992 frames    550.667 ms total roundtrip latency
	extra loopback latency: 26431 frames
	use 13215 for the backend arguments -I and -O
 26623.993 frames    554.667 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.993 frames    554.667 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.993 frames    554.667 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.990 frames    554.666 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.991 frames    554.666 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.992 frames    554.667 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.992 frames    554.667 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 26623.991 frames    554.666 ms total roundtrip latency
	extra loopback latency: 26623 frames
	use 13311 for the backend arguments -I and -O
 27455.991 frames    572.000 ms total roundtrip latency
	extra loopback latency: 27455 frames
	use 13727 for the backend arguments -I and -O
 27455.991 frames    572.000 ms total roundtrip latency
	extra loopback latency: 27455 frames
	use 13727 for the backend arguments -I and -O


------------------

















>
>> > 3. If pa_source and pa_sink are a single Jack client (probably not),
>> >    subtract one period from the result of (2).
>>
>> Can you explain that with the data above?
>
> If they are a single Jack client you create a loop in Jack's
> processing graph, this adds one period to the measurement.
>
>
>> > 4. Add the two values.
>> >
>>
>> I would like to provide an app for this task. Do you think it would be
>> worthwhile to extend jack_iodelay for this purpose?
>
> Don't see how. You need to do two measurements anyway, no matter
> how it's done, then add or substract.
>
> Ciao,
>
> --
> FA
>
> A world of exhaustive, reliable metadata would be an utopia.
> It's also a pipe-dream, founded on self-delusion, nerd hubris
> and hysterically inflated market opportunities. (Cory Doctorow)
>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>


--
Patrick Shirkey
Boost Hardware Ltd
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