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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87hcyk4awg.fsf@gandalf.hd.free.fr>
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/