Re: [Xen-devel] [PATCH v12] tolerate jitter in cpu_khz calculation to avoid TSC emulation

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.03.19 at 13:09, <olaf@xxxxxxxxx> wrote:
> Am Mon, 11 Mar 2019 05:19:34 -0600
> schrieb "Jan Beulich" <JBeulich@xxxxxxxx>:
> 
>> But of course the seemingly
>> random 200 will itself need a much better reasoning, or at least a
>> clear indication of the data base (number of different systems) that
>> it was derived from. "Large number of hosts", after all, may mean 12
>> to you and tens of thousands to me.
> 
> How many hosts would be relevant?

I don't know. More than dozens but less than tens of thousands,
I'd say.

> My own test hosts calibrate itself in a range of maybe 30 khz.
> I gave up to track the exact numbers after every reboot.

The variance of the calibration result says nothing about the
absolute error, nor about any possible drift. It's only an indication
of the quality of the calibration logic _plus_ the stability of the
base frequency.

Jan



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