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

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Message-ID: <20080917143439.5ce79534@infradead.org>
Date:	Wed, 17 Sep 2008 14:34:39 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: How how latent should non-preemptive scheduling be?

On Wed, 17 Sep 2008 22:18:18 +0100
Sitsofe Wheeler <sitsofe@...oo.com> wrote:

> Hi,
> 
> 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:
> 
> > Cause                                                Maximum
> > Percentage Scheduler: waiting for cpu                        247.2
> > msec         64.6 % futex_wait do_futex sys_futex
> > sysenter_do_call      5.0 msec         24.8 % do_select
> > core_sys_select sys_select sysenter_do_c  4.7 msec          0.7 %
> > do_sys_poll sys_poll sysenter_do_call               4.5


this says you haven't done "make install" on the latencytop directory
so it's not translating things for you.. can you do that please?
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