[time-nuts] Legal Time dissemination
gsricalde at gmail.com
Tue May 28 09:10:14 EDT 2013
That looks like a server in an room with unstable temperature. Try
graphing the server's frequency (ntpq rv or ntpdc loopinfo/kerninfo if
enabled on the server), a rising frequency will correlate with a
positive offset if that is the case.
On Tue, May 28, 2013 at 7:52 PM, Miguel Barbosa Gonçalves <m at mbg.pt> wrote:
> Lately I've been using the two stratum 2 servers our national observatory
> provides to the public mainly as backup for my GPS based local NTP servers.
> I've always found odd that one of them exhibited an erratic behaviour when
> compared to the other one.
> I decided to use ntpdate on one of my stratum 1 machines (Trimble
> AcutimeGold in position hold mode; looking at my loopstats file my
> clock is always
> within 5 us of UTC) against these 2 servers every minute for a while and
> plotted the results. Offset is in seconds and time is UTC.
> I am on a fibre asymmetrical connection 100 Mbps/25 Mbps. The offsets for
> the best behaved server are expected but... the other server?
> After gathering enough data I'll contact them as ask what is the problem
> with the server...
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