PerfCountSinceTick and PerfCountFreq
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8/27/2008
PerfCountSinceTick and PerfCountFreq access a high-performance counter that is synchronized with the thread timer. They typically use the thread timer itself.
They are most effective when the underlying timer counts are fast enough to provide meaningful data.
If the thread timer is running at a rate of one tick per millisecond, these routines will not provide much information. If the underlying counter runs at a rate of 100 ticks per millisecond or more, the latency timers will be much more useful.
See Also
Concepts
Supporting Interrupt Latency Timing
High-Performance Counter Support