Bug#396117: ITP: cpufreq-detect -- detect CPU frequency control driver
On Tue, 31 Oct 2006 23:25:46 -0500
Anthony DeRobertis <anthony@derobert.net> 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.
Anecdotal confirmation - on my Celeron M 420 (1.6 GH), using
p4_clockmod causes an enormous drop in perceived responsiveness, but no
apparent gain in battery life; I get the same time to discharge either
way.
Celejar
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