Re: time keeping

[Sarton O'Brien <bsd-xen%roguewrt.org@localhost>]

Emmanuel Dreyfus wrote:
> Hello
>
> Sorry if I missed an important piece of documentation, but here is the
> question: how am I supposed to keep clocks in sync with NetBSD/xen?
>
> I run ntpd on dom0 and domU, and the clocks always drift. I resync
> manually when I have several minutes of difference, because it starts
> producing bugs, but I am certain this situation is not normal and there
> is a fix. 
>
> Here is my ntpd.conf:
> pidfile /var/run/ntpd.pid
> driftfile       /var/db/ntp.drift
> logconfig       -syncstatus
> tos     minsane 2
> server  ntp.example.net
>
> The only machine that has good timekeeping is the NTP server itself. It
> is a xen domU and it uses ntp1.jussieu.fr and  chronos.cru.fr as the
> underlying stratum servers.
>
> This NTP server seems to work, since clients can sync using ntpdate. But
> on the long term, clients ntpd will never keep the clock in sync.

I've had issues in the past but can't remember the details. In the end 
my dom0 became the main time server with all domu being peers with dom0 
and the tos minsane set to 1 for all domu.

As dom0 theoretically is the first server to start and the last to stop, 
with the added benefit of an rtc, this made sense to me ... at the time :)

Sarton