[Xen-devel] Re: [PATCH] CPUIDLE: revise tsc-save/restore to avoid big tsc skew between cpus

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 05/12/2008 13:06, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

>> Below patch should be what you expected. It will still bring continuously
>> increasing tsc skew. If I pin all domains' vcpus on 1 pcpu, the skew is
>> increasing faster.
> 
> I applied a modified version of this as c/s 18873. Primarily I removed
> scale_time() and replaced with a simpler reciprocal function which is applied
> to scale factors to invert them. Please take a look.

I should have tested the reciprocal function before checkin. A fixed (and
now rather less simple) version is in c/s 18875.

 -- Keir



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