[linux-audio-user] Re: [Jackit-devel] 2.6.10

[Matthew Allen]

On Sun, 2 Jan 2005 12:46:38 -0000 (WET), Rui Nuno Capela
<rncbc at rncbc.org> wrote:
> Hi,
> Matthew Allen wrote:
> > using 2.6.10-rc3-mm with Ingo's latest Real-Time Preempt on a pentium
> > M 1.6ghz laptop with a gig of ram. The test was done as a normal user
> > using the realtime-lsm patch and I have Rui's rtirq script up and
> > running. One of the three tests was completed while compiling gnuplot
> > in the background :).
> >
> 
> Please always try with latest JACK CVS, where some additional statistics
> are available [0.99.41+]. Read on.

Ok so I now have the latest jack:
$  jackd -V
jackd version 0.99.43 tmpdir /tmp protocol 15

$  uname -r
2.6.10-rc3-mm1-V0.7.33-04

patched with Ingo's Real-time preempt.
CONFIG_PREEMPT_RT=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_SOFTIRQS=y
CONFIG_PREEMPT_HARDIRQS=y
CONFIG_PREEMPT_BKL=y

and as far as I know its on:
$  cat /proc/sys/kernel/kernel_preemption 
1

The machine definetly hangs after about 18 clients (a hard lock that
requires cycling power). With 14 clients and everything else the same
(actually I set my playbackrate to 48k) I get this. Which looks pretty
poor.

I am testing with an i8x0 in a 1.6ghz centrino. The alsa-driver is 1.0.8_rc1

*********** CONSOLIDATED RESULTS ************
Total seconds ran . . . . . . :   600
Number of clients . . . . . . :    14
Ports per client  . . . . . . :     4
Frames per buffer . . . . . . :    64
*********************************************
Summary Result Count  . . . . :     2 /     2
*********************************************
Timeout Rate  . . . . . . . . :(    0.0)/hour
XRUN Rate . . . . . . . . . . :   138.0 /hour
Delay Rate (>spare time)  . . : 1515072.0 /hour
Delay Rate (>1000 usecs)  . . :     0.0 /hour
Delay Maximum . . . . . . . . : 47335   usecs
Cycle Maximum . . . . . . . . :   966   usecs
Average DSP Load. . . . . . . :    60.0 %
Average CPU System Load . . . :    39.5 %
Average CPU User Load . . . . :    15.6 %
Average CPU Nice Load . . . . :     0.0 %
Average CPU I/O Wait Load . . :     0.5 %
Average CPU IRQ Load  . . . . :     0.0 %
Average CPU Soft-IRQ Load . . :     0.0 %
Average Interrupt Rate  . . . :  1819.7 /sec
Average Context-Switch Rate . : 92310.4 /sec
*********************************************

jacking up the frames to 128 gives me a little better performance, but
I really must be missing something.

*********** CONSOLIDATED RESULTS ************
Total seconds ran . . . . . . :   600
Number of clients . . . . . . :    14
Ports per client  . . . . . . :     4
Frames per buffer . . . . . . :   128
*********************************************
Summary Result Count  . . . . :     2 /     2
*********************************************
Timeout Rate  . . . . . . . . :(    0.0)/hour
XRUN Rate . . . . . . . . . . :    24.0 /hour
Delay Rate (>spare time)  . . : 761487.0 /hour
Delay Rate (>1000 usecs)  . . :     0.0 /hour
Delay Maximum . . . . . . . . : 45056   usecs
Cycle Maximum . . . . . . . . :  1888   usecs
Average DSP Load. . . . . . . :    73.8 %
Average CPU System Load . . . :    40.5 %
Average CPU User Load . . . . :    22.9 %
Average CPU Nice Load . . . . :     0.0 %
Average CPU I/O Wait Load . . :     1.5 %
Average CPU IRQ Load  . . . . :     0.0 %
Average CPU Soft-IRQ Load . . :     0.0 %
Average Interrupt Rate  . . . :  2416.9 /sec
Average Context-Switch Rate . : 94092.5 /sec
*********************************************