Re: [Xen-devel] [RFC] Physical hot-add cpus and TSC

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 26/05/2010 18:39, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

>> But what we do in 4.0 is whack all the TSCs at boot time... How is this
>> any different?
> 
> I don't think we do that anymore, at least not when the
> underlying machine is deemed to have a stable TSC
> (Invariant TSC or constant/nonstop TSC with max_cstate<3).

Hm, yep, looks like we skip it when we detect 'reliable tscs'. So on modern
x86 that means we do not modify TSCs in Xen ever.

 -- Keir



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