[ntp:questions] time reset, syncronisation lost and Large PPM values

tor tz at lv.fo
Fri Oct 21 17:29:28 UTC 2005


Something bothers  ntpd so it looses sync about every half hour.
The messages from two versions of ntpd are given below.

What is going on here and what can I do about it?

Running RHEL3 on Dell PowerEdge 2600.
$uname -a: Linux srv3 2.4.21-9.0.3.ELsmp #1 SMP Mon May 3 13:49:17 WEST 2004
i686 i686 i386 GNU/Linux

Similar behaviour is also seen on a HP box running RHEL3.

First the stock ntpd:

Oct 19 17:19:09 srv3 ntpd[19356]: ntpd 4.1.2 at 1.892 Wed Oct 19 17:18:24 WEST
2005 (1)
Oct 19 17:19:09 srv3 ntpd[19356]: precision = 7 usec
Oct 19 17:19:09 srv3 ntpd[19356]: kernel time discipline status 0040
Oct 19 17:19:09 srv3 ntpd[19356]: frequency initialized 500.000 from
/var/lib/ntp/drift
Oct 19 17:19:09 srv3 ntpd: ntpd startup succeeded
Oct 19 17:22:33 srv3 ntpd[19356]: kernel time discipline status change 41
Oct 19 17:23:36 srv3 ntpd[19356]: kernel time discipline status change 1
Oct 19 17:37:36 srv3 ntpd[19356]: time reset 0.256144 s
Oct 19 17:37:36 srv3 ntpd[19356]: synchronisation lost
Oct 19 18:00:11 srv3 ntpd[19356]: time reset 0.239413 s
Oct 19 18:00:11 srv3 ntpd[19356]: synchronisation lost

Then I tried with a more recent version of ntpd (and started with -g)

Oct 20 15:37:12 srv3 ntpd[20655]: ntpd 4.2.0 at 1.1161-r Thu Oct 20 14:07:07
WEST 2005 (1)
Oct 20 15:37:12 srv3 ntpd[20655]: precision = 1.000 usec
Oct 20 15:37:12 srv3 ntpd[20655]: no IPv6 interfaces found
Oct 20 15:37:12 srv3 ntpd[20655]: kernel time sync status 0040
Oct 20 15:37:13 srv3 ntpd[20655]: frequency initialized 500.000 PPM from
/var/lib/ntp/drift
Oct 20 15:40:31 srv3 ntpd[20655]: synchronized to LOCAL(0), stratum=10
Oct 20 15:40:31 srv3 ntpd[20655]: kernel time sync disabled 0041
Oct 20 15:41:34 srv3 ntpd[20655]: kernel time sync enabled 0001
Oct 20 15:45:48 srv3 ntpd[20655]: synchronized to 84.16.227.206, stratum=3
Oct 20 15:45:49 srv3 ntpd[20655]: synchronized to 81.7.132.92, stratum=2
Oct 20 15:45:53 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 15:54:28 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:07:10 srv3 ntpd[20655]: synchronized to 217.114.97.97, stratum=2
Oct 20 16:09:27 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 16:09:31 srv3 ntpd[20655]: time reset +0.683516 s
Oct 20 16:09:31 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:13:47 srv3 ntpd[20655]: synchronized to LOCAL(0), stratum=10
Oct 20 16:13:47 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:14:51 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:15:57 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:17:01 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:18:06 srv3 ntpd[20655]: frequency error 502 PPM exceeds tolerance
500 PPM
Oct 20 16:19:11 srv3 ntpd[20655]: synchronized to 217.114.97.97, stratum=2
Oct 20 16:19:14 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 16:39:32 srv3 ntpd[20655]: synchronized to 81.7.132.92, stratum=2
Oct 20 16:42:43 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 16:47:12 srv3 ntpd[20655]: synchronized to 217.114.97.97, stratum=2
Oct 20 16:47:15 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 16:47:15 srv3 ntpd[20655]: time reset +0.803924 s
Oct 20 16:51:34 srv3 ntpd[20655]: synchronized to LOCAL(0), stratum=10
Oct 20 16:56:49 srv3 ntpd[20655]: synchronized to 213.144.132.251, stratum=2
Oct 20 16:56:55 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 17:09:45 srv3 ntpd[20655]: synchronized to 217.114.97.97, stratum=2
Oct 20 17:09:51 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 17:17:19 srv3 ntpd[20655]: time reset +0.713103 s
Oct 20 17:21:41 srv3 ntpd[20655]: synchronized to LOCAL(0), stratum=10
Oct 20 17:26:55 srv3 ntpd[20655]: synchronized to 81.7.132.92, stratum=2
Oct 20 17:27:02 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1

Oct 20 17:39:50 srv3 ntpd[20655]: synchronized to 81.7.132.92, stratum=2
Oct 20 17:44:10 srv3 ntpd[20655]: synchronized to 200.23.51.205, stratum=1
Oct 20 17:44:14 srv3 ntpd[20655]: time reset +0.600966 s





More information about the questions mailing list