On 04/19/2010 01:49 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.
Fun, we also have:
X86_FEATURE_NONSTOP_TSC, which states the thing doesn't stop in C
states.
All of them? I though tsc stops in some mwait deep REM sleep thing.
So what do we need? test for both TSC_RELIABLE and NONSTOP_TSC? IMO
TSC_RELIABLE should imply NONSTOP_TSC.
--
error compiling committee.c: too many arguments to function
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