[ntp:questions] how to have offset < 1ms

David J Taylor david-taylor at blueyonder.co.uk.invalid
Tue Apr 13 10:15:17 UTC 2010


> After one night, the delay is 29.626
>     remote           refid      st t when poll reach   delay
> offset  jitter
> ==============================================================================
> *ntpgmtaceb      .1PPS.           1 u  406 1024  377   29.626
> 0.867   1.231
>
> if I put the line:
> server  ntpgmtaceb  iburst  maxpoll 5
>
> ntpq -p:
> No association ID's returned
>
> If I run
> ntpdate ntpgmtaceb
> and I restart ntpd
> delay is 0.169:
>
>     remote           refid      st t when poll reach   delay
> offset  jitter
> ==============================================================================
> ntpgmtaceb      .1PPS.           1 u   12   64    1    0.169
> 3.814   0.001
>
> ntpdate seems to be better?

There's something strange about your LAN if 9a) the delay is 29 
milliseconds and (b) it varies so much.

If the line
  server  ntpgmtaceb  iburst  maxpoll 5

didn't work it may be that your NTP (ntpd 4.2.2p1) is too old for those 
options.  Try without the iburst.

Cheers,
David
 




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