[ntp:questions] Slow convergence of NTP with GPS/PPS
Richard B. Gilbert
rgilbert88 at comcast.net
Fri Oct 24 13:00:09 UTC 2008
Nicola Berndt wrote:
> Unruh schrieb:
>> "Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
>>> David Woolley wrote:
>>>> Richard B. Gilbert wrote:
>>>>> To turn your equipment on after months of downtime and expect it to
>>>>> lock on to the correct time with millisecond accuracy within seconds
>>>>> is asking for a hell of a lot.
>>>> Not really. He's starting a GPS receiver at the same time and that has
> Btw, I have minpoll 4 maxpoll 4 in my ntp.conf and ntpq -p says: "poll
> 16". Is it the poll of ntpq -p or of ntpd?
It's the poll interval of ntpd. Ntpq does not poll! The poll interval
varies between 2^MINPOLL and 2^MAXPOLL. You have set MINPOLL=MAXPOLL=4
giving a poll interval of 2^4 or 16 seconds. This is usually the
correct choice for a GPS receiver. For getting time over the internet
it would, under most circumstances, be a horrible choice!
More information about the questions