Messages in this thread | | | Date | Sat, 31 Mar 2007 12:02:09 +0200 | From | Andi Kleen <> | Subject | Re: exposing FSB clock speed in /sys |
| |
> I am not interested in older processors, but I think for all recent Intel > processors, there is a fairly simple algorithm to get the frequency using > a couple of MSRs (including MSR_IA32_EBL_CR_POWERON or MSR_FSB_FREQ).
Hmm, maybe make it an own driver that creates the sysfs entries somewhere. I don't think it's useful enough for the main kernel.
But what happens during power saving that may lower the frequency? Wouldn't you need update events for that? That might complicate it.
> > Don't we already have /sys entries that exits only for certain processors > or platforms?
Yes.
> I think the Opteron have HYPERTRANSPORT-related events which could be used > to obtain similar metrics.
Yes, but you usually don't need the frequency.
-Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |