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

Fabien Ribes FribesAT at CapGeminiDOT.fr
Mon Oct 6 16:28:08 UTC 2003


Dear Hans,

Some more info:

It has been observed with ntp 4.1.0, running on linux 2.4.10.
It was running for days, with a drift file. As it is an embedded system 
, I can't turn on peerstat and loopstat easely.

Hans Jørgen Jakobsen wrote:
> 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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