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1.6ghz
2012 Feb 17
3
Re: Xen domU Timekeeping (a.k.a TSC/HPET issues)
...; hpet tick. We believe
Windows 7 QPC also reads the TSC at that point. The TSC kept on ticking
while the vcpu was paused. Windows does not know what to do about the
discrepancy and reports a large time leap, usually consistent with a full
round trip of the 32 bit hpet counter at the Xen-emulated 1/16GHz
frequency.
MSDN forums blame "bad hardware" for this. Funny.
So, we could solve our particular problem if the tsc were not to tick
during vcpu sleep. And I get an inkling that would help with this post as
well. But I don''t think any of the advertised timer or tsc modes do that....