From: Bruno Ducrot <ducrot@poupinou.org>
To: Erik Slagter <erik@slagter.name>
Cc: Cpufreq@lists.linux.org.uk
Subject: Re: writing a cpufreq driver
Date: Sat, 23 Sep 2006 17:31:57 +0200 [thread overview]
Message-ID: <20060923153157.GS4945@poupinou.org> (raw)
In-Reply-To: <45140FFC.1060305@slagter.name>
On Fri, Sep 22, 2006 at 06:31:56PM +0200, Erik Slagter wrote:
> > I'm now sure the southbridge is throttling the processor...
>
> I was always told that throttling the processor doesn't yield any
> powersaving? And that is exactly what my last two motherboards show.
In fact this depend if frequency and 'performance for a given task' is
linear or not. On older systems (as the one from the OP) there
is an huge performance penalty (external L2 cache if even there is one)
when running at full. Throttling the processor can then achieve
power saving.
--
Bruno Ducrot
-- Which is worse: ignorance or apathy?
-- Don't know. Don't care.
next prev parent reply other threads:[~2006-09-23 15:31 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-22 16:31 writing a cpufreq driver Erik Slagter
2006-09-23 15:31 ` Bruno Ducrot [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-09-21 18:48 Ryan Underwood
2006-09-21 19:31 ` Dave Jones
2006-09-21 19:38 ` Langsdorf, Mark
2006-09-21 19:47 ` Dave Jones
2006-09-22 15:44 ` Bruno Ducrot
2006-09-22 15:49 ` Dave Jones
2006-09-21 20:08 ` Ryan Underwood
2006-09-21 20:44 ` Dave Jones
2006-09-21 21:03 ` Ryan Underwood
2006-09-21 21:13 ` Dave Jones
2006-09-22 14:13 ` Ryan Underwood
2006-09-22 14:39 ` Ryan Underwood
2006-09-22 15:48 ` Bruno Ducrot
2006-09-22 16:01 ` Ryan Underwood
2006-09-22 15:51 ` Dave Jones
2006-09-22 15:39 ` Bruno Ducrot
2006-09-22 16:00 ` Ryan Underwood
2006-09-22 16:05 ` Bruno Ducrot
2006-09-22 16:11 ` Ryan Underwood
2006-09-23 15:07 ` Bruno Ducrot
2006-09-23 15:21 ` Ryan Underwood
2006-09-23 15:44 ` Bruno Ducrot
2006-09-23 16:03 ` Ryan Underwood
2006-09-23 16:13 ` Bruno Ducrot
2006-09-25 15:39 ` Ryan Underwood
2006-10-02 2:19 ` Dominik Brodowski
2006-09-25 16:44 ` Ryan Underwood
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