linux-kernel - Re: How how latent should non-preemptive scheduling be?

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Message-ID: <48D17681.4040109@yahoo.com>
Date:	Wed, 17 Sep 2008 22:28:33 +0100
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	linux-kernel@...r.kernel.org
CC:	Ingo Molnar <mingo@...e.hu>, Arjan van de Ven <arjan@...radead.org>
Subject: Re: How how latent should non-preemptive scheduling be?

Sitsofe Wheeler wrote:
> I have an EeePC 900 (Intel Celeron 900Mhz) and it seems to be skipping 
> while playing sound through various desktop apps with a 2.6.27rc6 
> kernel. It is running off an SD card which really shows up slow writes 
> but the sound is seemingly skipping even when ext3 is not being used. 
> When look at latencytop I often see results similar to this:

One other small datapoint. When the skipping starts to occur regularly 
it seems to be exactly 30 seconds apart. ALSA doesn't report any xruns 
either...
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