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

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Date:	Fri, 22 Jan 2010 10:34:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <efault@....de>
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 10:25 +0100, Mike Galbraith wrote:
> 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.

That's a laptop with full desktop bloat, I'm sure either firefox or evo
farted, or both.

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