linux-kernel - Re: scheduler vs hardware? (was Re: another i7 (linux) bug?)

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Message-Id: <1264152314.12530.8.camel@marge.simson.net>
Date:	Fri, 22 Jan 2010 10:25:14 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Luca Zini <luca.zini@...il.com>, aagaande@...il.com,
	rdelcueto@...mail.com, mingo@...e.hu,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Chiang <achiang@...com>
Subject: Re: scheduler vs hardware? (was Re: another i7  (linux) bug?)

On Fri, 2010-01-22 at 09:51 +0100, Peter Zijlstra wrote:

> My laptop does:
> 
> 
> # time nice -n 19 lame -b 256 -V0 -h youcantdothat.wav - > /dev/null

> real    0m3.273s
> user    0m3.217s
> sys     0m0.022s
> 
> 
> # time nice -n 0 lame -b 256 -V0 -h youcantdothat.wav - > /dev/null

> real    0m1.121s
> user    0m1.102s
> sys     0m0.013s

I don't see any way that can be scheduler (knocks wood).  Could it be
cpufreq?  IIRC there is or was an ignore nice gizmo in there.

	-Mike 

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