Re: [Xen-devel] [PATCH] replace rdtsc emulation-vs-native xen boot option with per-domain (hypervisor part)

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 06/10/2009 08:07, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

>> Perhaps a better choice would be for emulated tsc
>> to return Xen system time in both kernel and user
>> mode (which is what it does for HVM domains) and,
>> when a domain has tsc_native==0,
>> Xen sets its pvclock parameters so that no scaling
>> occurs?  This results in the guest reporting that
>> it has a 1GHz clock, but may be more consistent.
> 
> Yes, this has to be fixed. There's no good reason for different TSC
> behaviours between kernel and userspace when both are emulated. If nothing
> else, when Jeremy's patches go in (which I am sure they will, as the concept
> is sane and the implementation appears so too) then that is going to be
> incompatible with emulated tsc as it behaves currently.

Should be fixed by c/s 20271.

 -- Keir



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