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

From: Florian Schmidt <mista.tapas@email-addr-hidden>
Date: Fri Jul 29 2005 - 12:52:37 EEST

On Fri, 29 Jul 2005 05:11:22 +0200
Cesare <cesare@email-addr-hidden> wrote:

> I've tried also with a vanilla 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.


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.


Palimm Palimm!
Received on Fri Jul 29 16:15:14 2005

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