Ubuntu Servers :: NTP Failing To Sync - Offset Too Large
Jun 11, 2010
I'm having trouble keeping NTP synchronized and able to provide time updates to other devices on the private network. I believe this is because the server has a too large of offset, that causes all NTP clients syncing through the server to fail.
I have two setups, one working, one failing, with mostly identical installation and settings.
Setup A is the working setup, as I will name it, is ubuntu server edition 8.04 with kernel 2.6.33.1. ntpd version is 4.2.4p4.
ntpq -p outputs this information:
remote refid st t when poll reach delay offset jitter
================================================== ============================
*europium.canoni 193.79.237.14 2 u 925 1024 377 101.851 0.194 0.328
ntp.conf is:
[Code]....
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Oct 16, 2010
SuSE 11.2 = 2.6.31, ntpd 4.2.4p7. My offset and jitter are large compared to what I see on the internet. I have also been trying to use a GPS+PPS but that doesn't seem to matter one way or the other. They usually start out with offset and jitter in the single digits and drift / move to something like -400 and 80 over a couple of hours. I have tried various remedies under ntp.org like HZ=100, setting clocksource to tsc, hpet, or acpi_pm. I do not know what to do with acpi so i didn't test that. One of my systems has drift of < +-20 which is good. I have tried it on another identical system and also an 11.1 system. One of the systems is not behind my firewall. They do not run a firewall themselves or VM or pretty much anything as they are not being used.
I have used ntp.conf with/without 'prefer'. Here is a recent ntpq -p:
remote refid st t when poll reach delay offset jitter
xSHM(0) .GPS. 0 l 1 16 377 0.000 508.652 177.858
*SHM(1) .PPS. 0 l 3 16 377 0.000 81.463 13.790
+131.107.13.100 .ACTS. 1 u 1 64 373 55.209 107.670 19.061
+saturn.netwrx1. .PPS. 1 u 11 64 377 59.973 100.192 10.695
+tick.usask.ca .GPS. 1 u 9 64 377 81.503 97.608 10.434
-97.f7bed1.clien 192.5.41.40 2 u 58 64 377 39.804 104.353 11.306
+dev1-c.nym009.i 128.4.1.1 2 u 23 64 377 46.182 104.460 11.550
+ntp2.Rescomp.Be 128.32.206.54 2 u 15 64 377 77.153 92.867 14.428
+ds3-us.zagbot.c 204.9.54.119 2 u 35 64 377 38.797 96.360 9.053
+montblanc.arbor 208.66.175.36 2 u 26 64 377 34.713 93.690 14.534
Is there something wrong with 11.1 and 11.2 ?
Here is the ntp as run from /etc/init.d/ntp start (also with yast):
21238 ? Ss 0:00 /usr/sbin/ntpd -p /var/run/ntp/ntpd.pid -g -u ntp:ntp -i /var/lib/ntp -c /etc/ntp.conf
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[Code]....
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My server is:
Version:
istributor ID:Ubuntu
Description:Ubuntu 6.06.2 LTS
Release:6.06
Codename:dapper
Linux morpheus 2.6.15-55-amd64-server #1 SMP Tue Dec 1 18:31:51 UTC 2009 x86_64 GNU/Linux
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[Code]....
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[Code]...
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Code:
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[code]....
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