[ntp:questions] ntpd losing sync

A C agcarver+ntp at acarver.net
Mon Feb 6 06:10:08 UTC 2012


I just observed a single event occur while monitoring peers, loops and 
the log file.  I'm waiting to see if it recovers but the single event 
has caused ntpd to oscillate wildly.  All afternoon the clock was 
actually very stable.  Then in two cycles there was a major upset that 
caused the PPS offset to run off.  You can see it in the peers.  It's 
still going on as I type this with spike_detects coming every minute or 
so in the log file.

If it doesn't recover on its own I'll restart with the new statistics 
turned on.

According to the log file:

5 Feb 07:50:32 ntpd[4538]: 199.4.29.166 8014 84 reachable
5 Feb 08:25:34 ntpd[4538]: PPS(0) 914a 8a sys_peer
6 Feb 05:56:55 ntpd[4538]: 0.0.0.0 0113 03 spike_detect -0.142499 s
6 Feb 05:59:35 ntpd[4538]: 0.0.0.0 0115 05 clock_sync
6 Feb 06:00:39 ntpd[4538]: 0.0.0.0 0113 03 spike_detect -0.242543 s

Then peers:

55963 21174.982 127.127.28.0 937a -0.036527778 0.000000000 0.002060405 
0.012926837
55963 21190.981 127.127.22.0 974a 0.000005336 0.000000000 0.000523922 
0.000061035
55963 21222.982 127.127.22.0 974a 0.000003197 0.000000000 0.000523922 
0.000061035
55963 21254.983 127.127.22.0 974a 0.000004286 0.000000000 0.000523922 
0.000061035
55963 21287.090 127.127.22.0 974a 0.000005560 0.000000000 0.000523922 
0.000061035
55963 21303.076 127.127.28.0 937a -0.019713861 0.000000000 0.002110174 
0.011155165
55963 21318.983 127.127.22.0 974a -0.000008341 0.000000000 0.000523922 
0.000061035
55963 21350.985 127.127.22.0 974a -0.000004278 0.000000000 0.000523922 
0.000061035
55963 21384.000 127.127.22.0 974a -0.001758997 0.000000000 0.001542449 
0.001758229
55963 21416.000 127.127.22.0 974a -0.142499126 0.000000000 0.003439354 
0.142249996
55963 21432.000 127.127.28.0 937a -0.168592361 0.000000000 0.004960079 
0.141854415
55963 21448.000 127.127.22.0 974a -0.292503723 0.000000000 0.004388269 
0.276412286
55963 21480.000 127.127.22.0 974a -0.442512698 0.000000000 0.004862297 
0.394614125
55963 21512.000 127.127.22.0 974a 0.372477306 0.000000000 0.005099591 
0.524797280
55963 21544.000 127.127.22.0 974a 0.212477028 0.000000000 0.005217774 
0.372601026
55963 21560.000 127.127.28.0 937a -0.876175806 0.000000000 0.006281705 
0.828569130
55963 21576.000 127.127.22.0 974a 0.064972383 0.000000000 0.005273983 
0.281162546
55963 21608.000 127.127.22.0 974a -0.085036439 0.000000000 0.005301131 
0.267636422
55963 21640.000 127.127.22.0 974a -0.242543129 0.000000000 0.005314721 
0.328885633
55963 21672.000 127.127.22.0 974a -0.417550277 0.000000000 0.005316239 
0.449024152
55963 21688.000 127.127.28.0 937a -1.438793917 0.000000000 0.006622632 
1.301765314
55963 21704.000 127.127.22.0 974a 0.417441425 0.000000000 0.005316787 
0.572346355

And loops:

55963 20583.108 -0.000004030 -77.476 0.000023538 0.018362 5
55963 20615.120 -0.000011522 -77.476 0.000034580 0.017176 5
55963 20647.067 -0.000019403 -77.476 0.000022564 0.016067 5
55963 20679.135 -0.000016818 -77.476 0.000027012 0.015029 5
55963 20711.117 -0.000013483 -77.476 0.000019619 0.014058 5
55963 20743.048 -0.000014919 -77.476 0.000013916 0.013150 5
55963 20775.113 -0.000008527 -77.476 0.000017337 0.012301 5
55963 20807.112 -0.000011718 -77.530 0.000012284 0.022500 5
55963 20839.060 -0.000004594 -77.530 0.000013441 0.021047 5
55963 20871.097 -0.000012778 -77.530 0.000011339 0.019687 5
55963 20903.096 -0.000016090 -77.530 0.000021048 0.018416 5
55963 20935.034 0.000003993 -77.530 0.000015891 0.017226 5
55963 20967.106 -0.000011338 -77.530 0.000015260 0.016114 5
55963 20999.101 0.000005648 -77.530 0.000016931 0.015073 5
55963 21031.061 -0.000001776 -77.530 0.000015476 0.014100 5
55963 21063.099 0.000007183 -77.519 0.000014616 0.013824 5
55963 21095.096 -0.000006261 -77.519 0.000017900 0.012932 5
55963 21127.091 -0.000008640 -77.519 0.000021572 0.012096 5
55963 21159.092 -0.000015364 -77.519 0.000012772 0.011315 5
55963 21191.091 -0.000011846 -77.519 0.000024291 0.010584 5
55963 21223.086 -0.000010005 -77.519 0.000029655 0.009901 5
55963 21255.077 -0.000014266 -77.519 0.000026303 0.009261 5
55963 21287.103 0.000005807 -77.519 0.000012665 0.008663 5
55963 21319.029 -0.000008613 -77.659 0.000012296 0.050375 5
55963 21351.084 0.000011018 -77.659 0.000275145 0.047121 5
55963 21385.000 -0.000009136 -77.659 0.000012402 0.044078 5
55963 21577.000 -0.000004309 -77.659 0.000012402 0.041231 5
55963 21609.000 -0.000003802 -77.659 0.000012402 0.038568 5
55963 21769.000 -0.000002032 -77.659 0.000012402 0.036077 5
55963 21801.000 -0.000001793 -77.659 0.000012402 0.033747 5



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