Re: Bug#396117: ITP: cpufreq-detect -- detect CPU frequency control driver
On Wed, Nov 01, 2006 at 10:07:24AM +0100, Brice Goglin wrote:
> Anthony DeRobertis wrote:
> > Peter Palfrader wrote:
> >
> >> How come it never outputs p4_clockmod? I use that happily on several
> >> different machines.
> >>
> >>
> >
> > I can confirm I've tried it on a machine. The performance impact was
> > substantial (at least if I allowed it to go to its lowest speed); the
> > power consumption difference was immeasurable[0].
> >
> > Have you actually measured the power savings?
> >
> > [0] Immeasurable as in the measurement equipment (an UPS with load
> > indication, in this case) could not notice any difference. The same UPS
> > does notice a substantial difference with K8 chips.
> >
>
>
> >From what I remember reading on some LKML threads a while ago,
> p4-clockmod is not that interesting because it only does throttling
> (divides the frequency only) while the important thing to do to reduce
Yes, p4-clockmod is mostly useless for power saving but it helps
reducing the processor temperature. And this is the only driver working
for my p4 desktop.
--
mattia
:wq!
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