[: Re: [ntp:questions] Re: dcf77 receiver makes ntp unstable? (drift and offset get jumpy)]

Folkert van Heusden folkert at vanheusden.com
Mon Feb 7 12:59:49 UTC 2005


> >When I switch on my DCF77 receiver, my ntp-server suddenly gets very 
> >unstable:
> >http://keetweej.vanheusden.com/ntp_graph.png
> >(the blue line indicates start of DCF77 receiver).
> >Running ntpq 4.2.0a at 1.1190-r on a P-III (1GHz) with Linux (2.6.9).
> Can you tell a little bit more?
> E.g. ther "server" and "fudge" lines of /etc/ntp.conf,

server & fudge:
erver 127.127.8.0 prefer mode 14
fudge  127.127.8.0 time1 0.25925012652
# keetweej
peer 192.168.64.99
server ntp.xs4all.nl
server ntp2.nl.uu.net
server ntp3.fau.de
server ntps1-1.cs.tu-berlin.de

> the output o ntpq -p,

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
xGENERIC(0)      .DCFa.           0 l   60   64  377    0.000    7.015   6.418
+keetweej.intran 193.79.237.14    2 u   96  128  376    0.004  -14.535   3.985
-auth1.xs4all.nl 193.79.237.14    2 u    -  128  377    8.262    2.749   9.433
*ntp1.NL.net     .GPS.            1 u    4  128  377   18.523  -19.571   6.273
+ntp3-rz.rrze.un .DCFp.           1 u   33  128  377   26.343  -13.832   4.405
+sombrero.cs.tu- .PPS.            1 u    1  128  377   24.989  -19.101   4.683

> the units of your graph?

horizontal: ignore the values under the line. every 5 minutes I take a sample
drif and offset are in the units as ntpdc etc. return them
dcf77% is the percentage of correctly received timestamps


Folkert van Heusden

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