On 2 Aug 2006, at 15:06, Jan Beulich wrote:
> Can someone give me an understanding what the current position on
> allowing dom0 to manipulate the CPU frequency is? The
> config options haven''t been disabled for a while, but when I
recently
> did a build there were still symbols missing for
> some of the drivers. Also, I continue to believe that playing with the
> CPU frequency behind the back of Xen isn''t the
> best idea.
>
> Thanks, Jan
I''ve been thinking about it and come to the conclusion that the right
thing is to let dom0 fiddle with the CPU frequencies, subject to:
1. It should have a 1:1 mapping to physical CPUs (i.e., VCPU0 always
runs on CPU0, VCPU1 on CPU1, etc.). Preferably we''d also pass real
topology info to dom0 too, so that it can do the right thing for
multi-core and hyperthreads.
2. We need an interface for dom0 to tell Xen that the speed is
changing, so that scale factors can be updated.
-- Keir
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