linux-kernel - Re: PCM distorsion snapshots from SATA/ALSA conflict (was: [Alsa-user] Pb with simultaneous SATA and ALSA I/O)

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Date:	Sun, 08 Oct 2006 12:41:13 -0400
From:	Lee Revell <rlrevell@...-job.com>
To:	Dominique Dumont <domi.dumont@...e.fr>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	alsa-user <alsa-user@...ts.sourceforge.net>,
	Francesco Peeters <Francesco@...Peeters.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCM distorsion snapshots from SATA/ALSA conflict (was:
	[Alsa-user] Pb with simultaneous SATA and ALSA I/O)

(it's probably a bad idea to attach .jpgs to a LKML post - please post
them on the web and send a URL)

On Sun, 2006-10-08 at 12:38 +0200, Dominique Dumont wrote:
> Anyway, the oscilloscope shows that:
> - a spike occurs every 330 useconds (about 3kHz)
>   (note: 330us is 15.85 times the period of the 48KHz spdif stream) 
> - the spike level roughly matches the level of the sine waves 330
>   useconds sooner
> 

You seem to be using a period size of 256 samples - any change if you
use a larger period size?

Any change if you use setpci to increase LATENCY_TIMER for the SBLive!
card?

Lee

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