[LAU] Phonic Helix Board 12 FireWireMKIIcompatibility(linux/ffado)

[Simon W. Fielding]

-----Original Message-----
From: linux-audio-user-bounces at lists.linuxaudio.org on behalf of Simon W. Fielding
Sent: Thu 2/5/2009 12:33
To: linux-audio-user at lists.linuxaudio.org
Subject: Re: [LAU] Phonic Helix Board 12 FireWireMKIIcompatibility(linux/ffado)
 
> From: Robert Jonsson [mailto:spamatica at gmail.com] 
> Sent: 04 February 2009 13:07
> To: Simon W. Fielding
> Cc: linux-audio-user at lists.linuxaudio.org
> Subject: Re: [LAU] Phonic Helix Board 12 FireWire
MKIIcompatibility(linux/ffado)

> That would be a good deed.

> Probably Pete has more pressing needs than me, but still. The things
I'd like to 
> know of the top of my head are basically:
> - if it's relatively stable. 
> - no artifacts in the sound, clicks etc, recording for a while with
lowish latency should prove "something"
> - What kind of latency to expect, this might be a bit of work to
determine. Not sure myself how to do it 
> other than tuning a complete system and bringing the buffers down to
the lowest that are usable.

OK - I now have a working basic FC10 system - relevant details are :-

Hardware: Toshiba Tecra M3
Kernel: 2.6.26.8-1.rt15.1.fc10.ccrma.i686.rt
Jackd: jackdmp 1.9.1
ffado: 2.0-0.6.rc1.fc10.ccrma (libffado 1.999.40)


Initial cursory testing shows (no recording load, just an idle mixer with nothing connected) :-

jackd -R -dfirewire -r96000 -p16 -n3 ... jackd won't even start - uses too much CPU
jackd -R -dfirewire -r96000 -p32 -n3 ... jackd won't even start - uses too much CPU

Both of the above seem to sometimes leave the 1394 bus in a strange state. A forced bus reset using
gscanbus seems to fix it.

jackd -R -dfirewire -r96000 -p64 -n3 ... jackd starts - uses approx 70% CPU with xruns every 10-20 seconds
jackd -R -dfirewire -r96000 -p128 -n3 ... jackd starts - uses approx 50% CPU - no xruns
jackd -R -dfirewire -r96000 -p256 -n3 ... jackd starts - uses approx 45% CPU - no xruns
jackd -R -dfirewire -r96000 -p512 -n3 ... jackd starts - uses approx 25% CPU - no xruns

This is all I have time for today - I'll try and do more later this week. If I've missed any useful
details, please ask and I'll try to get them posted.

Cheers,
Simon

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