Hello All,
I came across the following: https://lkml.org/lkml/2019/8/29/536
Could that be the reason for the problem mentioned below? Xen is using
HPET as clocksource on the platform/mainboard. Is there an (easy) way to
verify if Xen uses PC10?
Regards Andreas
On 12.10.2019 20:47, Andreas Kinzler wrote:
Hello all, hello Paul,
On a certain new mainboard with chipset C242 and Intel Xeon E-2136 I
notice a severe clock drift. This is from dom0:
# uptime
20:13:52 up 81 days, 1:41, 1 user, load average: 0.00, 0.00, 0.00
# hwclock
2019-10-12 20:27:37.204966+02:00
# date
Sat Oct 12 20:07:19 CEST 2019
Kernel is 4.13.16 vanilla, Xen 4.10.2
So after 81 days uptime there is a difference of over 20 minutes
between "date" and "hwclock". I operate many Xen servers and have
never seen such a great drift except on this type of mainboard. What
could be the reason?
In general, what is the current best practice for NTP sync? Run it in
dom0? In domU? Both? How does the domU type (Linux HVM/PVM/PVH or
Windows HVM with WinPV drivers) make a difference?
Regards Andreas
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