linux-kernel - Re: [Alsa-user] Pb with simultaneous SATA and ALSA I/O

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Date:	Wed, 04 Oct 2006 12:45:35 +0200
From:	Dominique Dumont <domi.dumont@...e.fr>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	alsa-user <alsa-user@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Alsa-user] Pb with simultaneous SATA and ALSA I/O

Lee Revell <rlrevell@...-job.com> writes:

> It might not be interrupt related, it could be DMA starvation.  This has
> been observed with some SATA controllers while testing the -rt patches.
> The symptom is that the latency traces show the machine going in "slow
> motion".
>
> Dominique: try the -rt kernel, enable latency tracing and post the
> output.

Done. I've tried with 2.6.18-rt5. CONFIG_LATENCY_TRACE is enabled.

Here are the results (still with running "ac3dec -C " and "md5sum *"
on a SATA drive): 
- I get no more ALSA xrun.
- /proc/latency_trace is empty
- dolby digital output is still considerably chopped.

Note that the dolby digital output works fine when:
- No I/O is done 
- heavy I/O on pata HDD (md5sum *)
- heavy I/O on DVD reader (md5sum *)

Did I miss something with the latency_trace ?

Cheers
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