[ntp:questions] Timekeeping on Windows 2008r2 VM on Linux QEMU/KVM
martin.burnicki at meinberg.de
Wed Jan 21 13:28:31 UTC 2015
Sander Smeenk schrieb:
> Quoting Harlan Stenn (stenn at ntp.org):
>> The time values are in milliseconds, not seconds.
> Yes, that's right, my bad. :(
> But that's not the point, really.
> The offets keep increasing and increasing up to the point
> where ntpd.exe drops all the servers and sync_ntp flag is lost.
> The exact same ntp servers are used on Linux VMs running on the same
> QEMU/KVM host and they do not show the increasing offsets and jitter
> Something is awry and i can't figure out what, where and why. :/
Windows isn't a very good timekeeper anyway.
I don't find it surprising that Linux VMs are behaving nicer. Linux
timekeeping is more stable anyway, and since QEMU/KVM is also based on
Linux I would expect they work better together than Windows on Linux.
I see you already run ntpd v4.2.8 in your VM, which already contains a
workaround for another deficiency in Windows, where small tick
adjustments are not handled correctly.
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