[ntp:questions] Very large offset and jitter values after reboot

Unruh unruh-spam at physics.ubc.ca
Mon Aug 25 18:17:17 UTC 2008

"David J Taylor" <david-taylor at blueyonder.neither-this-bit.nor-this-part.co.uk> writes:

>Nicola Berndt wrote:
>> Richard B. Gilbert schrieb:
>>> 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.
>> Yes, I do. Strange, right?

>Is there any chance that the PPS you are using is 400ms or 600ms long, and 
>you are actually syncing off the wrong edge of the pulse - and not the 
>edge which co-incides with the UTC second?

He is not using pps-- his pps line is too noisy. He is using nmea strings.
Now, we know that the nmea string is long (esp at the default 4800bd)
so it might be that ( needs to use one of the fudges to adjust the time)


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