[ntp:questions] GPS_NEMA, but high offset and jitter?
Kelsey Cummings
kgc at sonic.net
Mon Feb 22 19:44:41 UTC 2010
FreeBSD 8.0, with built in ntpd (4.2.4p5) and PPS_SYNC enabled with a
Garmic 18LVC.
Using the following options:
server 127.127.20.1 mode 0 minpoll 4 maxpoll 4 prefer
fudge 127.127.20.1 flag1 1 flag3 1 refid GPS
server 0.pool.ntp.org iburst maxpoll 9
server 1.pool.ntp.org iburst maxpoll 9
server 2.pool.ntp.org iburst maxpoll 9
server 3.pool.ntp.org iburst maxpoll 9
Is resulting in:
remote refid st t when poll reach delay offset
jitter
==============================================================================
GPS_NMEA(1) .GPS. 0 l 66h 16 0 0.000 -192.53
27.455
*216.45.57.38 209.81.9.7 2 u 469 512 377 11.990 2.871
0.449
-tantalum.srvcs. 192.43.244.18 2 u 336 512 377 76.924 -29.311
2.300
+208.96.18.74.se 199.212.17.35 3 u 339 512 377 4.792 4.906
1.466
+mirror 204.9.54.119 2 u 283 512 377 86.562 9.086
2.488
The -192.52 and 27.455 stats for the GPS have been constant for 72+
hours now. Any suggestions as to what the problem could be?
--
Kelsey Cummings - kgc at sonic.net sonic.net, inc.
System Administrator 2260 Apollo Way
707.522.1000 (Voice) Santa Rosa, CA 95407
707.547.2199 (Fax) http://www.sonic.net/
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