From: Ingo M. <mi...@el...> - 2007-10-29 23:45:01
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* Jeremy Fitzhardinge <je...@go...> wrote: > > if it's inaccurate why are you exposing it to the guest then? Native > > only uses the TSC if it's safe and accurate to do so. > > It is used as part of the Xen clocksource as a short term > extrapolator, with correction parameters supplied by the hypervisor. > It should never be used directly. that's totally broken then. You cannot create an SMP-safe monotonic clocksource via interpolation - native does not do it either. Good thing this problem got exposed, it needs to be fixed. Ingo |