Re: [Xen-devel] [PATCH] 1/2: cpufreq/PowerNow! in Xen: Time and platform changes

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 31/8/07 16:09, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

> Agree, and some of my colleagues currently works on that part (More
> specifically, Winston Wang and Ke Yu). But one caveat is that C-state
> is still likely to be changed dynamically due to hardware event, like AC
> power change on mobile or some monitor logic on server.

Does this affect the available C states, or the current C state of a CPU? I
suppose it's the former that matters, since an attempt to deep-sleep may
start to fail, which would lead to increased power consumption?

Xen should be very easy indeed to make tickless when idle. In fact the PIT
handler can be disabled on most systems - we just haven't bothered to
implement that simple bit of logic yet.

 -- Keir



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