[ntp:questions] Regular spike_detect on syslog

Sean Austin Critica sean.critica at gmail.com
Fri Sep 14 08:50:47 UTC 2018


Hello,


I'm new to configuring NTP, and am having a bit of trouble figuring out why
there are regular spike_detect messages on my syslog.

I already checked the connection to the NTP server and it is stable with no
packet drops.
Additionally, that same NTP server is used by another machine on the same
network and it is synchronizing fine. So it seems isolated to this
particular machine.


I find one particular sequence curious. From 17:30 to 18:53, there was a
positive spike, followed by a negative spike, followed by a positive spike
interleaved with clock_sync.
Can you give me some hints regarding what may be causing this?


Jun  5 14:48:32 info localhost ntpd[13659]:  Listen normally on 48 bond0
10.119.218.249 UDP 123
Jun  5 14:48:32 info localhost ntpd[13659]:  Listen normally on 49 lo ::1
UDP 123
Jun  5 14:48:32 info localhost ntpd[13659]:  Listen normally on 50 bond0
fe80::217:a4ff:fe77:c38 UDP 123
Jun  5 14:48:32 info localhost ntpd[13659]:  Listening on routing socket on
fd #68 for interface updates
Jun  5 14:48:32 info localhost ntpd[13659]:  0.0.0.0 c016 06 restart
Jun  5 14:48:32 info localhost ntpd[13659]:  0.0.0.0 c012 02 freq_set
kernel 0.059 PPM
Jun  5 14:50:21 info localhost ntpd[13659]:  0.0.0.0 c615 05 clock_sync
Jun  5 15:03:36 info localhost ntpd[13659]:  0.0.0.0 0618 08 no_sys_peer
Jun  5 15:07:55 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.269228 s
Jun  5 15:16:37 info localhost ntpd[13659]:  0.0.0.0 061c 0c clock_step
+0.303049 s
Jun  5 15:16:37 info localhost ntpd[13659]:  0.0.0.0 0614 04 freq_mode
Jun  5 15:16:38 info localhost ntpd[13659]:  0.0.0.0 c618 08 no_sys_peer
Jun  5 15:31:55 info localhost ntpd[13659]:  0.0.0.0 c612 02 freq_set
kernel -186.040 PPM
Jun  5 15:31:55 info localhost ntpd[13659]:  0.0.0.0 c615 05 clock_sync
Jun  5 15:42:11 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.147942 s
Jun  5 15:56:51 info localhost ntpd[13659]:  0.0.0.0 0618 08 no_sys_peer
Jun  5 16:02:50 info localhost ntpd[13659]:  0.0.0.0 061c 0c clock_step
+0.338653 s
Jun  5 16:02:50 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 16:02:51 info localhost ntpd[13659]:  0.0.0.0 c618 08 no_sys_peer
Jun  5 16:06:14 info localhost ntpd[13659]:  0.0.0.0 0628 08 no_sys_peer
Jun  5 17:30:59 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.130410 s
Jun  5 17:33:09 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 17:47:21 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
-0.136758 s
Jun  5 18:01:30 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 18:53:59 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.165088 s
Jun  5 19:01:40 info localhost ntpd[13659]:  0.0.0.0 0618 08 no_sys_peer
Jun  5 19:03:51 info localhost ntpd[13659]:  0.0.0.0 061c 0c clock_step
+0.306834 s
Jun  5 19:03:51 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 19:03:52 info localhost ntpd[13659]:  0.0.0.0 c618 08 no_sys_peer
Jun  5 19:31:08 info localhost ntpd[13659]:  0.0.0.0 0628 08 no_sys_peer
Jun  5 19:58:28 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.130703 s
Jun  5 20:05:00 info localhost ntpd[13659]:  0.0.0.0 061c 0c clock_step
+0.281475 s
Jun  5 20:05:00 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 20:05:01 info localhost ntpd[13659]:  0.0.0.0 c618 08 no_sys_peer
Jun  5 20:34:30 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
-0.167769 s
Jun  5 20:36:40 info localhost ntpd[13659]:  0.0.0.0 0618 08 no_sys_peer
Jun  5 20:40:00 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 20:53:04 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.184006 s
Jun  5 21:05:06 info localhost ntpd[13659]:  0.0.0.0 061c 0c clock_step
+0.415902 s
Jun  5 21:05:06 info localhost ntpd[13659]:  0.0.0.0 0615 05 clock_sync
Jun  5 21:05:07 info localhost ntpd[13659]:  0.0.0.0 c618 08 no_sys_peer
Jun  5 21:08:28 info localhost ntpd[13659]:  0.0.0.0 0628 08 no_sys_peer
Jun  5 21:32:26 info localhost ntpd[13659]:  0.0.0.0 0638 08 no_sys_peer
Jun  5 22:38:01 info localhost ntpd[13659]:  0.0.0.0 0613 03 spike_detect
+0.132145 s


Regards,
Sean Critica


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