On Tue, 3 Mar 2020 at 15:47, mabi <mabi@protonmail.ch> wrote:
> It looks like there is a time issue on that VM although I am running the default ntpd of OpenBSD 6.6 and I have added the following parameter into my /etc/sysctl.conf on that VM:
>
> kern.timecounter.hardware=tsc
I've had similar issues with timekeeping within guests of VMM,
although there are improvements in -current with the pvclock time
source. Since the fix below I now see occasional instances of the
clock stepping by a few whole seconds (typically less than 8s) but
it's much less frequent and the magnitude is within the bounds of what
ntpd can correct.
See http://openbsd-archive.7691.n7.nabble.com/pvclock-stability-tp376946p377922.html
for some backstory
(aside: I see similar small occasional clock jumps of an integer
number of seconds on OpenBSD-6.6 guests using tsc running on a VMware
ESXi host)
Regards
Ian
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