Report TSC multiplier

[dtaskoff]

Since most recent CPUs have different TSC, and CPU frequencies, reading the TSC multiplier is essential, in order to report an accurate frequency.

I will try to implement this change myself, but any help would be appreciated, as well!

[dtaskoff]

My bad, it seems like you're already doing this in get_info_*_multiplier, am I right?

[anrieff]

Yes, there are two ways to read the true CPU frequency:

• cpu_clock_by_ic() - which does not care about TSC multipliers and all - just a busy loop with a predictable instruction throughput, so it is a real benchmark of what the CPU actually outputs;
• RDMSR approach using get_info_*_multiplier and cpu_clock_by_mark() machinery

Both are valid.