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Intel documentation mentions the 1 millisecond update time for the power and temperature MSRs in a couple of places. I have seen it in the chapter on power monitoring in Volume 3 of the SW Developers Manual, and I think it is also in the Uncore Performance Monitoring Guides for the various Xeon E5 processors.
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John D. McCalpin wrote:
Intel documentation mentions the 1 millisecond update time for the power and temperature MSRs in a couple of places. I have seen it in the chapter on power monitoring in Volume 3 of the SW Developers Manual, and I think it is also in the Uncore Performance Monitoring Guides for the various Xeon E5 processors.
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Yes. One of the manuals says that these power and temperature MSR values are only updated about once per millisecond, so querying them more frequently is just extra overhead.

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