Subject: Re: [Alsa-user] Pb with simultaneous SATA and ALSA I/O
From: Lee Revell <rlrevell@joe-job.com>
To: Dominique Dumont <domi.dumont@free.fr>
Cc: alsa-user <alsa-user@lists.sourceforge.net>,
       Francesco Peeters <Francesco@FamPeeters.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <878xjs1geq.fsf@gandalf.hd.free.fr>
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Date: Sat, 07 Oct 2006 13:08:34 -0400
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On Sat, 2006-10-07 at 14:03 +0200, Dominique Dumont wrote:
> Lee Revell <rlrevell@joe-job.com> writes:
> 
> > Did you ever try the latency tracer?  (See LKML archives for
> > instructions)
> 
> Yes I did (this time better than 2 or 3 days ago :-/ ).
> 
> - I compiled and booted 2.6.28-rt5 with latency tracer enabled
> - I verified that I got latency trace enabled (seen trace in kern.log)
> 
> I only got some traces after running this (detail added for the sake
> of other newbies like me) :
> 
>    gandalf:/proc/sys/kernel# echo 0 > preempt_max_latency
> 
> Here's the max latency trace I got (note that I got a similar trace
> *before* running the test, so I'd say it's unrelated to the AC3
> drop-out problem.):

I think it must be an electrical noise issue.

Lee

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