Re: [Xen-devel] [PATCH v13] tolerate jitter in cpu_khz calculation to avoid TSC emulation

[Olaf Hering <olaf@xxxxxxxxx>]

Am Wed, 13 Mar 2019 03:18:39 -0600
schrieb "Jan Beulich" <JBeulich@xxxxxxxx>:

> The discontinuity is still there, and so far you've failed to explain
> why a discontinuity is what you want here.

In v12 you asked for some data about the ranges. With new data the ranges are:

2.20GHz 29khz
2.30GHz 105khz
2.40GHz 3524khz
2.50GHz 114khz

There are 5 systems in total in the 2.3/2.4/2.5 classes that have a much higher 
frequency, making the total range 15382/6052/19179.
I have to check what these runaway values mean.

The total range within the ntp.drift file is -71.138..345.942 for >2000 hosts.

I will see if any experiments can be done on the hosts which are on the edge of 
a frequency change. Would be nice to know if ntpd can cope with tsc_mode=native 
for example when a domU is migrated from one to the other.

Olaf

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