| Brice Goglin 2006-11-01, 7:23 am |
| Anthony DeRobertis wrote:
> Peter Palfrader wrote:
>
>
> 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
power consumption is to use C-states as other drivers/processors do
(reduce both frequency and voltage).
http://marc.theaimsgroup.com/?l=lin...72746504710&w=2
http://marc.theaimsgroup.com/?l=lin...23706515874&w=2
Brice
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