-asm pause / rep; nop cycle time?

-asm pause / rep; nop cycle time?

On Xeon or Hyper-Threading tech, what isthe cycle time for rep; nop or _asm pause? The documentation hints that it can be anywhere from a nop to some definite value. So any guess as to what it may be?

Thanks in advance

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FYIanswer is in Watercooler forum.

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