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80000000h
2010 Sep 17
2
Constant vs Nonstop vs Invariant TSC question
...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 constant rate in all ACPI P-, C-. and T-states. This is the architectural behavior moving forward. On processors with invariant TSC support, the OS may use the TSC for wall clock timer services (instead of ACPI or HPET timers). TSC reads are much more effici...