Messages in this thread | | | Date | Mon, 19 Apr 2010 13:54:12 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH 1/5] Add a global synchronization point for pvclock |
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On 04/19/2010 01:51 PM, Peter Zijlstra wrote: > > >>> Right, so on x86 we have: >>> >>> X86_FEATURE_CONSTANT_TSC, which only states that TSC is frequency >>> independent, not that it doesn't stop in C states and similar fun stuff. >>> >>> X86_FEATURE_TSC_RELIABLE, which IIRC should indicate the TSC is constant >>> and synced between cores. >>> >>> >>> >> Sockets and boards too? (IOW, how reliable is TSC_RELIABLE)? >> > Not sure, IIRC we clear that when the TSC sync test fails, eg when we > mark the tsc clocksource unusable. >
Worrying. By the time we detect this the guest may already have gotten confused by clocks going backwards.
-- error compiling committee.c: too many arguments to function
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