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SubjectRe: CPU throttling??
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
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