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How can one find "P0 frequency"?

Question asked by jcownie on Jul 17, 2020
Latest reply on Jul 28, 2020 by jcownie

The TSC runs at "P0 frequency", but  I cannot see how to read that from any configuration information in user-space. 

Intel processors have the base frequency in the CPU identity string "Intel(r) foo(r) processor @ 99.9GHz", but AMD ones do not. There seems no cpuid leaf which would give me this, and, (on Linux), looking at

/sys/devices/system/cpu/cpuN/cpufreq/ only has max and min frequency files, which, again do not reflect the notional P0 frequency.

 

Surely there's some way to find this out!?

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