From: Matt Reppert <arashi@arashi.yi.org>
To: Valdis.Kletnieks@vt.edu
Cc: linux-kernel@vger.kernel.org
Subject: Re: CPU throttling??
Date: Mon, 3 Feb 2003 13:14:56 -0600 [thread overview]
Message-ID: <20030203131456.34c04df8.arashi@arashi.yi.org> (raw)
In-Reply-To: <200302031857.h13IvHa0025735@turing-police.cc.vt.edu>
On Mon, 03 Feb 2003 13:57:17 -0500
Valdis.Kletnieks@vt.edu wrote:
> On Mon, 03 Feb 2003 17:13:02 GMT, John Bradford said:
>
> > Incidently, Linux has always halted the processor, rather than spun in
> > an idle loop, which saves power.
>
> It's conceivable that a CPU halted at 1.2Gz takes less power than one
> at 1.6Gz - anybody have any actual data on this? Alternately phrased,
> does CPU throttling save power over and above what the halt does?
Yes. I have a powerpc laptop that runs at 700 MHz. If I throttle the CPU clock
speed down to 400 MHz and change nothing else the battery has noticeably longer
life; since it's running slower, it takes less power when it's active (not
halted).
Matt
next prev parent reply other threads:[~2003-02-03 19:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-03 15:47 Joeri Belis
2003-02-03 16:55 ` CPU throttling?? Seamus
2003-02-03 17:00 ` Dave Jones
2003-02-03 17:04 ` Martin Hermanowski
2003-02-03 17:13 ` John Bradford
2003-02-03 18:57 ` Valdis.Kletnieks
2003-02-03 19:02 ` Dave Jones
2003-02-03 19:09 ` Martin Hermanowski
2003-02-03 19:20 ` John Bradford
2003-02-04 14:12 ` Erik Mouw
2003-02-03 19:14 ` Matt Reppert [this message]
2003-02-03 19:24 ` Valdis.Kletnieks
2003-02-04 14:34 ` Daniel Egger
2003-02-03 21:14 Grover, Andrew
2003-02-03 21:18 ` Dave Jones
2003-02-03 21:41 ` John Bradford
2003-02-03 22:14 ` H. Peter Anvin
2003-02-03 22:31 ` Ville Herva
2003-02-04 10:22 ` Seamus
2003-02-04 10:31 ` John Bradford
2003-02-04 11:01 ` Seamus
2003-02-03 21:51 Grover, Andrew
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