linux-kernel - Re: [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU"

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Date:	Thu, 8 Oct 2009 22:59:34 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Mike Galbraith <efault@....de>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-wireless@...r.kernel.org
Subject: Re: [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU"

On Thursday 08 October 2009, Mike Galbraith wrote:
> I still see very high latencies coming out of idle (last noted was >
> 300ms, NO_HZ) with this patch,
>
> Like this:
>
> Cause                                           Maximum    Percentage
> Scheduler: waiting for cpu                   604.2 msec        49.0 %

I'm not seeing anything even remotely like that.

I've tried quieting the system down as much as possible, but that made
no difference. I do have NO_HZ set; will send my full config privately.

If you'd still like me to try your patch I will, but I'm not sure if
that has much value.

Cheers,
FJP
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