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

On Mon, 9 Feb 2009 16:47:39 -0000
"Simon W. Fielding" <s.fielding@email-addr-hidden> wrote:

> 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

Hmm this is good and bad news. That it works and does so without xruns is great but I'm not sure what
to make of the processor usage. For comparison, if I setup my inspiron 9400 to use -r96000 -p256 -n3
it uses less than a tenth of what you see. Mine has a core 2 duo t7200 2ghz CPU and an intel HDA
but even so.. 45% seems pretty onerous and surely not an indication that my system is 10 times faster than yours.

> 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.

I appreciate you going to the trouble. This is exactly what I wanted to know. :)

pete.
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Received on Mon Feb 9 20:15:02 2009