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PERF_PRECISION_TIMER

Description This counter type shows a value that consists of two counter values: the count of the elapsed time of the event being monitored, and the frequency from the system performance timer.
This counter type differs from other counter timers in that the clock tick value accompanies the counter value eliminating any possible difference due to latency from the function call. Precision counter types are used when standard system timers are not precise enough for accurate readings.
Generic type Percentage
Formula NX – N0 / D1 – D0 where the numerator (N) represents the counter value and the denominator (D) is the value of the system performance timer.
Average NX – N0 / D1 – D0
Example There are no counters of this type installed with Windows 2000.

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