[ntp:questions] Change poll interval at runtime?

David J Taylor david-taylor at blueyonder.co.uk.invalid
Sun Feb 26 07:19:44 UTC 2012


"A C" <agcarver+ntp at acarver.net> wrote in message 
news:4F49CA89.9090409 at acarver.net...
> On 2/25/2012 21:55, Ron Frazier (NTP) wrote:
[]
>> # GPS Lines
>> server 127.127.20.5 prefer minpoll 3 maxpoll 6 mode 72
>> fudge 127.127.20.5 time2 0.3100 refid GPS1
>>
>> # Internet server lines
>> # NIST New York
>> server nist1-ny.ustiming.org minpoll 8 maxpoll 13
>>
>> # other internet server lines similar
>>
>> Sincerely,
>
> I know I can do that to the config file but then it takes forever to 
> synchronize.  As I said, the idea was to not give a min/maxpoll so that 
> ntpd would converge on a clock adjustment quickly (polling once ever 64 
> seconds) and then, after a couple days, I could throttle back the 
> polling interval without restarting the server and changing the 
> configuration file.

"Takes forever" is the problem you should try to solve.  With the systems 
here, which have a GPS/PPS ref clock, they are synced within a minute of 
NTP starting, although it takes longer to get the ultimate accuracy.  What 
version of ntp are you running, what OS, and what ref clock?

Cheers,
David 



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