> > I believe the patch is still necessary, since we still need to guarantee > that a vcpu's tsc is monotonous. I think there are three issues to be > addressed: > > 1. The majority of intel machines don't need the offset adjustment since > they already have a constant rate tsc that is synchronized on all cpus. > I think this is indicated by X86_FEATURE_CONSTANT_TSC (though I'm not > 100% certain if it means that the rate is the same for all cpus, Thomas > can you clarify?) > > This will improve tsc quality for those machines, but we can't depend on > it, since some machines don't have constant tsc. Further, I don't think > really large machines can have constant tsc since clock distribution > becomes difficult or impossible. > I have another newbie question: can the current Linux kernel handle the unsynced TSC? If kernel can't handle this case, it still has problem to run Linux on hardware with unsynced TSC.
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