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Re: [Xen-devel] [PATCH][Retry 1] 4/4: cpufreq/PowerNow! in Xen: PowerNow
| To: | "Langsdorf, Mark" <mark.langsdorf@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH][Retry 1] 4/4: cpufreq/PowerNow! in Xen: PowerNow! changes |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 31 Aug 2007 18:44:55 +0100 |
| Delivery-date: | Fri, 31 Aug 2007 10:41:04 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH][Retry 1] 4/4: cpufreq/PowerNow! in Xen: PowerNow! changes |
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On 31/8/07 17:56, "Langsdorf, Mark" <mark.langsdorf@xxxxxxx> wrote: >> Should we have a copy of that file in powernow-k8-xen.c? Can >> the patched file work correctly in a native Linux build? > > The patch is the same patch I submitted upstream for the native > 2.6.23 Linux kernel. > > In native mode, the kernel creates a cpumask for each cpu that > lists its sibling cores. Unfortunately, Xen doesn't do that. > The patch instead reads and parses the _PSD ACPI structure, > which indicates which cores share pstates with other cores. > (Frankly, _PSD is the right way to do it, but the other way > was easier until Linux got ACPI support for _PSD). If Xen > were using the same kernel version as Linux, the patch wouldn't > be necessary. Okay, that was the other possibility. :-) Fine then! -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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