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

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Message-ID: <13158.212.123.217.246.1159186633.squirrel@www.fampeeters.com>
Date:	Mon, 25 Sep 2006 14:17:13 +0200 (CEST)
From:	"Francesco Peeters" <Francesco@...Peeters.com>
To:	"Dominique Dumont" <domi.dumont@...e.fr>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"alsa-user" <alsa-user@...ts.sourceforge.net>
Subject: Re: [Alsa-user] Pb with simultaneous SATA and ALSA I/O

On Mon, September 25, 2006 13:55, Dominique Dumont wrote:
>
> Hello
>
> I have some problem using the SPDIF output of my SB Live card while
> performing I/O on my SATA drive. (See [1] for the whole story on the
> ALSA mailing list)
>
> My Yamaha amplifier does not recognize the AC3 (Dolby digital) stream
> from the sdpif plug while performing I/O on my SATA drive.
>
> If I have a lot of I/O (e.g. running md5sum on a 4Gb file), the AC3
> stream is completely broken.
>
> If I have some I/O (e.g. reading a Hi-def movie), I get some AC3
> drop-out even if the CPU is about 50%.
>
> I have the same result with DTS output.
>
> With PCM output, I've noticed a hi-frequency distortion, which means
> that the interaction between SATA and snd module occurs several
> thousands time per second.
>
> My set up is:
> - Debian Linux kernel 2.6.17
> - Sound blaster SB Live 5.1 (snd_emu10k1 module)
> - SATA drive (sata_sil and libata module)
> - A7n8x deluxe mobo
> - AMD XP 3200
>
> So far I verified that:
> - AC3 output works fine when SATA drive is left alone
> - AC3 output works fine when running md5sum on a PATA drive
> - DTS output works fine on the mobo SPDIF output (snd_intel8x0 module)
>   even when running md5sum on the SATA drive. (cannot try AC3 stream
>   because of Soundstorm chip :-( )
> - Preemp kernel option does not fix the problem
> - when running md5sum on SATA drive, alsa driver report a starvation
>   (xrun) every few seconds, not thousands of time per second.
>
> Could someone shed some light on this problem ?
>
> What can I do to help debug this problem ?
>
> Thanks
>
>

Have you tried using a different slot for the SB Live?

-- 
Francesco Peeters
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