[ntp:questions] Very large offset and jitter values after reboot
Richard B. Gilbert
rgilbert88 at comcast.net
Mon Aug 25 00:14:33 UTC 2008
Nicola Berndt wrote:
>>> remote refid st t when poll reach delay offset
>>>jitter
>>>==============================================================================
>>> GPS_NMEA(0) .GPS. 0 l 9 64 37 0.000 -580.75
>>>3965.19
>>
>>You've not had your first 8 samples yet. You haven't actually had
>>enough for ntpd to act on the data. You can speed that up with iburst,
>>but ntpd will still take a long time to get a very tight lock. jitter
>>will reduce as you get to the eight samples. The good? think, is that
>>you are more than 128ms out, so that ntpd will step the time, to zero
>>the offset, once it gets enough samples.
>
>
>
> Just tried the iburst option, but I had to figure it only works with the
> server command, not on refclocks.
>
> What really puzzles me, is the stoical 600 ms offset after rebooting.
> Since it is always returning having more or less the same amount, I
> should really be able to get rid of it, no?
600 ms seems to be a large error for a warm start. Are you using "-g"
to start ntpd? Forgive me if this has already been asked and answered.
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