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vol3
2010 Sep 17
2
Constant vs Nonstop vs Invariant TSC question
...constant vs nonstop vs invariant TSCs in newer processors. I understand constant tsc means the rate of the counter won''t vary if the CPU freq changes and non-stop means that it even continues to count when the cpu is in a low power state.
When I read Intel''s Designer''s vol3b, section 16.11.1 Invariant TSC it says the following
"16.11.1 Invariant TSC
The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC. Processors support for invariant TSC is indicated by CPUID.80000007H:EDX[8].
The invariant TSC will run at a cons...