Re: [RFC] fix VMX TSC synchronicity

Avi Kivity
2008-01-16T08:46:11Z

[fixing gmane emails, urgfhsz]

Andi Kleen wrote:
> Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> writes:
>
>
>> Thanks; that's reassuring to know that it will work (at least on Intel).
>>
>
> Actually there are modern Intel systems which still have instable TSCs;
> e.g. IBM Summit multi node systems and some others. So you should
> still handle that case.
>

I really don't see any way we could. If the guest assumes tscs are
synchronous, and they really are not, there's nothing we can do.

[well, we could trap and emulate rdtsc, but performance would tank]

You might taskset guests into a single node on such systems, which is a
good idea anyway.

--
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