On 04/19/2010 01:51 PM, Peter Zijlstra wrote:
Not sure, IIRC we clear that when the TSC sync test fails, eg when weRight, so on x86 we have:Sockets and boards too? (IOW, how reliable is TSC_RELIABLE)?
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.
mark the tsc clocksource unusable.
Worrying. By the time we detect this the guest may already have gotten confused by clocks going backwards.