[ntp:questions] Re: PPS sync: astonishing offset

Hans Jørgen Jakobsen hjj at wheel.dk
Mon Oct 6 15:35:05 UTC 2003


On Mon, 06 Oct 2003 16:53:30 +0200, Fabien Ribes wrote:
> hi all,
> 
> On a router synchronized to a Trimble GPS receiver I'm getting the 
> following results with ntpq:
> 
> Fri Oct  3 02:24:43 GMT 2003
> remote           refid      st t when poll reach   delay   offset   disp
>=========================================================================
> +127.127.29.0    .GPS.       0 l   20   32  377     0.00   -0.065   0.49
> o127.127.22.0    .PPS.       0 l    -   16  377     0.00   -0.209   0.24
> 
> which is OK for me, but one minute later, I get :
> 
> Fri Oct  3 02:25:59 GMT 2003
> remote           refid     st t when poll reach   delay   offset   disp
>=========================================================================
> +127.127.29.0    .GPS.      0 l    2   32  377     0.00   -3.713    0.47
> o127.127.22.0    .PPS.      0 l    2   16  377     0.00   -4.459    0.24
> 
> which makes me a bit puzzled, as many other equipments in the same 
> configuration are very stable. Any idea ?
> 
More data please. Enable peerstat (and loopstat) to get better view of the
problem. What OS? What ntp-version? How long has it been running?
Do you have a drift-file?
/hjj



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