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Re: [Xen-devel] Support for CPU frequency scaling in Xen

  • To: "Vahid Kazempour" <kazempour@xxxxxxxxx>
  • From: "Niraj Tolia" <ntolia@xxxxxxxxx>
  • Date: Tue, 3 Jun 2008 23:03:35 -0700
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 03 Jun 2008 23:03:58 -0700
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On Tue, Jun 3, 2008 at 9:24 PM, Vahid Kazempour <kazempour@xxxxxxxxx> wrote:
> Hi,
> Does Xen provide support for CPU frequency scaling?
> If there exists such support, from which version they support it?

In short, yes but YMMV. I saw a few patches on the list that added
frequency scaling to the hypervisor itself but I don't know the
current status for that. They should be in xen-unstable.

Another option is to set 'cpufreq=dom0-kernel' as an option for xen
and run cpufreqd in dom0. I have tested this on Intel's Core2 Duo and
AMD's Opterons. Xen 3.2.1 should have what you need but it is quite
possible that a previous version will also work.


> Otherwise what problems do exist in support frequency scaling in Xen?
> Thanks,
> Vahid
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