Messages in this thread | | | Subject | Re: How is user space notified of CPU speed changes? | From | Alan Cox <> | Date | Sat, 23 Oct 2004 22:19:28 +0100 |
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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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