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	Thu, 8 Oct 2009 10:16:02 -0400
Subject: Re: [.32-rc3] scheduler: iwlagn consistently high in "waiting for
 CPU"
From: Mike Galbraith <efault@gmx.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Frans Pop <elendil@planet.nl>,
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Date: Thu, 08 Oct 2009 16:15:12 +0200
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On Thu, 2009-10-08 at 06:45 -0700, Arjan van de Ven wrote:
> On Thu, 08 Oct 2009 13:24:22 +0200
> Mike Galbraith <efault@gmx.de> wrote:
> > Latencytop was accounting uninterruptible and interruptible sleep
> > time up to 5ms, which is not the latency the user is looking for.
> 
> it is for everything but the scheduler latency!
> 
> latencytop wants to show where you're waiting for disk, etc etc.
> that's not "time on runqueue".
> 
> for the scheduler delays a whole different codepath is used!

That explains.. a few things.

	-Mike