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Name: unknown
Date: March 20, 2004 at 15:54:56
Subject: Re: Finding CPU frequency
In Reply To: Re: Finding CPU frequency by
RJ on March 20, 2004 at 08:03:44
Text: | I found a way of finding the CPU clock frequency and its generic.
| I used the Windows DDK KeQueryPerformanceCounter api function for
| the reference time. KeQueryPerformanceCounter gives the time in seconds
| and using the RDTSC counter I was able to estimate the processor
| operating frequency.

So you wait n seconds and use the TSC to count clocks? If so, then keep
in mind that this method won't work if the processor in question has a
TSC which increments at the current core clock frequency, and that core
clock frequency changes during your measurement interval, e.g. because
of a SpeedStep-like power management.


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