Re: What contributes to IA64 ITC/TOD drift?

From: David Mosberger <>
Date: 2005-02-10 06:53:30
>>>>> On Tue, 8 Feb 2005 18:27:01 -0800, "John Lee" <> said:

  John> Maybe too broad a question but,

  John> 1. What in IA64 platform contributes to ITC drift?

Are you asking when the IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT bit should
be set?  If so, then the answer is that it should be set whenever the
ITC clocks of the processors in a machine are not driven off the same

  John> 2. What in IA64 platform contributes to TOD fluctuation?
  John> (excluding the quality of oscillator)

NTP comes to mind.  Any other error I can think of probably would lead
to a systematic error, not to fluctuations.

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Received on Wed Feb 9 14:54:19 2005

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