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Description
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SpeedStep P-state transitions are implemented as a write to a control MSR (to request
the transition) and a polling loop that reads a status MSR (to verify transition
completion). Unfortunately, for a number of reasons, there is no guarantee that the transition will be verifiable. So this polling loop is hardly worthwhile and wastes time
waiting for transition completion. There is no need to wait for the transition to
complete. If a new transition is requested before the old transition request completes,
then the new transition request starts processing immediately.
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