[ntp:questions] Slow convergence of NTP with GPS/PPS

David Woolley david at ex.djwhome.demon.co.uk.invalid
Tue Sep 30 21:46:28 UTC 2008


Kevin Oberman wrote:

> 
> Most important is to start ntpd at boot time with the -g option so that
> it will immediately set the time. Then adjust your ntp.conf to set the
> maxpoll and minpoll to 4 for your reference clock. 
> "minpoll 4 maxpoll 4"

Most reference clocks ignore maxpoll, and I think quite a lot ignore 
minpoll.

> 
> This will get the time synced to close to correct, hopefully a few
> microseconds, within a couple of minutes, depending on your hardware.

It will get you with a maximum error of about 128ms.  You can do 
somewhat better if you ensure that you start off more than 128ms out, as 
that will force an initial step.




More information about the questions mailing list