[ntp:questions] Score is drop in cycles

mingdawang at 163.com mingdawang at 163.com
Fri Feb 14 15:07:43 UTC 2014


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 at 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 at hz1-12-168 ~]# ntpd -!
ntpd 4.2.6p5
ntpd 4.2.6p5 at 1.2349-o Mon Jul 15 09:22:49 UTC 2013 (1)

[root at 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

[wangmd at 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

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

includefile /etc/ntp/crypto/pw

keys /etc/ntp/keys

statistics clockstats cryptostats loopstats peerstats sysstats protostats

[wangmd at hz1-12-168 ~]$ cat /etc/sysctl.conf
kernel.core_uses_pid = 1
kernel.msgmax = 65536
kernel.msgmnb = 65536
kernel.shmall = 4294967296
kernel.shmmax = 68719476736
kernel.sysrq = 0
net.core.netdev_max_backlog = 30000
net.core.rmem_default = 16384
net.core.rmem_max = 1073741824
net.core.somaxconn = 2048
net.core.wmem_default = 16384
net.core.wmem_max = 1073741824
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 0
net.ipv4.conf.eth1.rp_filter = 0
net.ipv4.conf.lo.rp_filter = 0
net.ipv4.ip_forward = 0
net.ipv4.ip_local_port_range = 32768 61000
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_max_orphans = 20480
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_mem = 8192 262144 4194304
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_rmem = 8192 65536 12582912
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_synack_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_wmem = 8192 65536 12582912
net.nf_conntrack_max = 2621440


2014-02-14
Mingda Wang



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