On 2014-02-14 08:07, [email protected] wrote:
Hi All,
I try add my ntp server to pool, but I found it's score is drop in
cycles ,
I think it's related to traffic,but the system's load is very low, I didn't
find
any error in log. How to find the bottleneck of the system?
Looking forward to your reply.
http://www.pool.ntp.org/scores/114.113.198.166
[root@hz1-12-168 ~]# uname -a
Linux hz1-12-168.inter.163.com 2.6.32-431.5.1.el6.x86_64 #1 SMP
Fri Jan 10 14:46:43 EST 2014 x86_64 x86_64 x86_64 GNU/Linux
[root@hz1-12-168 ~]# ntpd -!
ntpd 4.2.6p5
ntpd [email protected] Mon Jul 15 09:22:49 UTC 2013 (1)
[root@hz1-12-168 ~]# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
-64.113.32.5 .ACTS. 1 u 27 1024 377 358.521 -30.035 6.725
*137.189.4.10 .GPS. 1 u 750 1024 377 81.095 -3.238 8.187
+108.71.253.18 .GPS. 1 u 374 1024 377 311.508 -2.693 5.882
+83.163.209.244 .GPS. 1 u 416 1024 377 404.777 -1.397 7.461
-89.109.251.23 .PPS. 1 u 486 1024 377 295.556 -37.660 50.758
-193.190.230.65 .PPS. 1 u 546 1024 377 407.231 -17.679 19.307
Most of your delays are really long > 100ms which can make it difficult to keep
consistent time, with your offsets jumping between single and double digit ms,
and with monitoring dropouts, shown in the scores CSV log, reducing your points
by -5 to below 10 on your scores page every 3-4 hours.
You may be unable to do much about the dropouts with monitoring from Los
Angeles,
but if you can make your time more consistent, you will have a higher score
which
monitoring dropouts may not affect as much.
[wangmd@hz1-12-168 ~]$ cat /etc/ntp.conf
driftfile /var/lib/ntp/drift
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
add restrict limited to kod to rate limit requests:
restrict default kod limited nomodify notrap nopeer noquery
restrict -6 default kod limited nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1
server nist.netservicesgroup.com
server clock.cuhk.edu.hk
server t1.timegps.net
server ntp.remco.org
server ntp3.vniiftri.ru
server ntp1.oma.be
You may get better results by dropping all servers except ...hk
and replacing them by pool servers (add iburst for faster startup):
server clock.cuhk.edu.hk iburst
pool cn.pool.ntp.org iburst
pool asia.pool.ntp.org iburst
This may not be usable as a pool member, but you may be able to get in
contact via the pool to peer with more local servers having lower delay.
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
statistics clockstats cryptostats loopstats peerstats sysstats protostats
You may need to add before the line above:
enable stats
and you do not need clockstats if you are not running a local reference clock.
2014-02-14
Mingda Wang
--
Take care. Thanks, Brian Inglis
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