Thierry MARTIN wrote: > Oups? > > If I understand your post, tsc is the same as acpi_pm ?
No. TSC, acpi_pm, the CTC based software clock that PCs have always had, etc., are all fed from the same crystal, but run at different multiples of that crystal's frequency. Only the battery backed clock normally runs from a different crystal. Software can get the readings wrong by missing ticks, or in the case of the TSC counter, at least, by trying to work out the processor clock speed, rather than being told it; typically they time the TSC clock against the CTC one, during startup, and use that to calculate effective CPU clock frequency. The CPU clock frequency is slowed down by power management, so the TSC rate can vary. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
