Re: How is user space notified of CPU speed changes?

[Alan Cox]

On Sad, 2004-10-23 at 06:10, Lee Revell wrote:
> JACK makes extensive use of microsecond-level timers.  These must be
> calibrated at startup, and recalibrated when the CPU speed changes.  How
> does JACK register with the kernel to be notified when the CPU speed
> changes?

It did

- The kernel doesn't always know
- CPU speed is meaningless in hyper-threading since performance is not
x2 for two cores but instead varies
- It doesn't handle split CPU speed SMP - where CPU speeds vary
- God help you if virtualised

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