CPU frequency & time measurement

DISCUSSION Aron 2 participants 2 messages Apr 1, 2004

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Aron

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2004-04-01 11:48 UTC #0 lore raw

If the real-time environment measure time via some functions access TSC. Will the time measurement via TSC register be affected by adjusting the CPU frequency?

Thanks.

Dominik Brodowski

2004-04-01 12:03 UTC #1 lore raw

Quoted 3 lines · Aron

If the real-time environment measure time via some functions access TSC. Will the time measurement via TSC register be affected by adjusting the CPU frequency?

If it is a Pentium 4, there might be a chance that the TSC is unaffected. Else, the TSC is affected by adjusting the CPU frequency. The kernel core adapts to such frequency changes; nonetheless there is a small discrepancy whenever a frequency transition occurs.

Dominik

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