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Name: unknown
Date: March 21, 2004 at 02:59:37
Subject: Re: Finding CPU frequency
In Reply To: Re: Finding CPU frequency by
unknown on March 20, 2004 at 17:56:46
Text: || 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.
|
| Only if you sleep for n seconds. But if you do some chummy calculations,
| possibly involving all registers and being not-too-well cachable, it will
| wake up the dead, not to mention SpeedStep.

While this should help in most cases, it's not guaranteed to
prevent a really aggressive power management implementation
from trying to change the processor frequency.


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