linux-kernel - Re: cpu frequency maximized even for a niced job w/ v2.6.29-rc3

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Message-ID: <20090207115545.724911be@infradead.org>
Date:	Sat, 7 Feb 2009 11:55:45 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: cpu frequency maximized even for a niced job w/ v2.6.29-rc3

On Sat, 7 Feb 2009 11:30:10 +0100
Toralf Förster <toralf.foerster@....de> wrote:

> I'm wondering, why my ThinkPad T41 goes from 600 MHz to 1.7 GHz if I
> run this job :
> 
> $> while [[ true ]]; do nice -3 factor 273244676154386297; done
> 
> under v2.6.29-rc3-562-geda58a8.
> 
> Former version stays at min frequency (600 MHz).

The kernel has defaulted to this for I think a really long time;
maybe your "former version" was a distribution kernel with patches?

Either way this is a simple tunable in sysfs; and to be honest,
going to the full speed is very often the right behavior so as a
default it is quite sane...


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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