RE: [Xen-devel] HPET/PIT timer accuracy

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> We're not relying on TSC synchronisation between CPUs. They 
> can run at different frequencies, stop in deep sleep, and so 
> on. But we *do* want the frequency of each one to be as 
> stable as possible. I'd expect to get <1ppm stability from a 
> crystal source at constant temperature, no problem.

I'd wager the TSC is stable and it's the HPET that's wandering...

We'll probably just have to add more damping on the re-calibration.

Ian

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