Re: [Jack-Devel] ALSA PCM multi plugin and xruns

On Mon, Dec 10, 2012 at 06:41:04PM +0000, John Rigg wrote:
> I've tried smp_affinity here and it hasn't fixed the problem. It just
> took longer for the xrun messages to show up.
> 
> I set the smp_affinity for the two ice1712 cards (which are on IRQ20
> and 21) to CPU1 in my test system with the following:
> echo "2" > /proc/irq/20/smp_affinity
> echo "2" > /proc/irq/21/smp_affinity
> 
> Then I started jackd with my pcm_multi device at 96kHz and started
> jamin to generate some load. At first it looked like this had worked,
> but after about 5 minutes the xrun indications in jamin started piling
> up. Both IRQs are definitely handled by CPU1 according to frequent
> checks using cat /proc/interrupts.
> 
> My test system uses an AMD 4850e Athlon64x2 2.5GHz CPU. Running jamin at
> 96kHz uses 11% CPU according to jamin's load indicator.

Correction: It was running at 44.1kHz. For some reason the Audiophile
2496 cards only obey the jackd -r96000 option if used individually.
When used with pcm_multi and S/PDIF clock sync the master card always
starts at 44.1kHz unless explicitly set to the desired sample rate
in envy24control first. My main system with 3 x Delta 1010 always
obeys the jackd option. Sorry for the confusion.

John

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