[linux-audio-user] jack xruns on SUSE 9.3 with Edirol UA25 card - SOLVED

Florian Schmidt mista.tapas at gmx.net
Fri Jul 29 05:52:37 EDT 2005


On Fri, 29 Jul 2005 05:11:22 +0200
Cesare <cesare at poeticstudios.com> wrote:

> I've tried also with a vanilla 2.6.11.7 with both the realtime preempt 
> and the realtime-lsm patch. And got even more xruns.
> But maybe I haven't disabled some daemon or something else.

Hmm,

a realtime preempt kernel alone will not nessecarily do any good. You
need to tune the irq handlers. If your network irq handler has a higher
RT prio than the soundcard irq handler, xruns are preprogrammed.

If you run RP make sure that:

a] the soundcard irq has the highest prio in the system (i.e. around 90)

b] all other irq's are left near their default (around 50)

c] jackd's prio is inbetween (i use 70 with great results)

If you then still get xruns, the hw is to blame [imho]. Or maybe a bug
in RP patches. Use the latency diagnosis tools that the RP kernel
provides to find out what part of the kernel produces the delays.

Regards,
Flo

-- 
Palimm Palimm!
http://affenbande.org/~tapas/



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