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 power consumption is to use C-states as other drivers/processors do (reduce both frequency and voltage). http://marc.theaimsgroup.com/?l=linux-kernel&m=114072746504710&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=114123706515874&w=2 Brice -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]