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

Nicola Berndt nb at komeda-berlin.de
Mon Aug 25 08:59:48 UTC 2008


Richard B. Gilbert schrieb:
> 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.

Yes, I do. Strange, right?



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