[: 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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