| [chrony-users] chrony switch to low stratum very slow |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: [chrony-users] chrony switch to low stratum very slow
- From: chuang213 <chuang213@xxxxxxxxx>
- Date: Wed, 7 Aug 2019 12:02:50 -0700
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I am testing the chrony on the system:
Ubuntu 14.04.5 LTS, Trusty Tahr
uname -a
Linux test 4.4.32 #1 SMP Fri Feb 15 18:15:47 PST 2019 x86_64 x86_64
x86_64 GNU/Linux
chronyd --version
chronyd (chrony) version 3.4 (+CMDMON +NTP +REFCLOCK +RTC -PRIVDROP
-SCFILTER -SIGND +ASYNCDNS -SECHASH +IPV6 -DEBUG)
The system has two Ethernet port, one to outside with 172.19.40.1/23,
another one is local 192.168.10.1/24
I tested to connect/disconnect the outside connection to see how
chrony behavior. here is from /var/log/chrony/tracking.log
2019-08-07 00:18:30 192.168.10.9 3 -13.820 0.114
-2.498e-06 N 3 1.551e-05 -1.567e-06 3.144e-04 1.010e-04 2.611e-04
2019-08-07 00:18:47 192.168.10.9 3 -13.825 0.111
-1.229e-06 N 3 1.568e-05 8.938e-07 3.968e-04 5.977e-05 2.772e-04
2019-08-07 00:19:03 192.168.10.9 3 -13.833 0.110
-1.452e-06 N 3 1.984e-05 1.933e-06 3.144e-04 1.088e-04 2.781e-04
2019-08-07 00:19:19 192.168.10.9 3 -13.844 0.111
-1.883e-06 N 3 2.772e-05 2.995e-06 3.144e-04 1.129e-04 2.874e-04
2019-08-07 00:19:35 192.168.10.9 3 -13.856 0.098
-2.548e-06 N 3 3.288e-05 4.303e-06 3.144e-04 1.092e-04 2.932e-04
2019-08-07 00:19:51 172.19.40.23 2 -13.902 0.113
-1.776e-05 N 5 6.266e-05 5.908e-06 2.046e-04 4.573e-05 2.910e-04
2019-08-07 00:20:48 172.19.40.23 2 -13.972 0.105
-9.074e-06 N 5 7.709e-05 2.923e-06 2.425e-04 4.009e-05 2.351e-04
2019-08-07 00:21:20 172.19.40.23 2 -13.990 0.081
2.763e-07 N 5 8.214e-05 1.129e-05 2.363e-04 3.902e-05 2.092e-04
2019-08-07 00:21:52 172.19.40.23 2 -14.090 0.149
-3.840e-05 N 5 4.574e-05 1.001e-05 2.323e-04 3.813e-05 2.034e-04
2019-08-07 00:22:24 172.19.40.23 2 -14.144 0.097
-4.630e-06 N 5 4.560e-05 1.476e-05 2.307e-04 3.709e-05 2.408e-04
2019-08-07 00:22:57 172.19.40.23 2 -14.198 0.092
-1.083e-05 N 5 3.246e-05 1.388e-05 2.321e-04 3.596e-05 2.072e-04
2019-08-07 00:23:29 172.19.40.23 2 -14.210 0.064
-3.854e-06 N 5 2.936e-05 1.218e-05 2.322e-04 3.571e-05 2.121e-04
2019-08-07 00:24:01 172.19.40.23 2 -14.223 0.056
-1.091e-05 N 5 2.402e-05 1.022e-05 2.019e-04 3.509e-05 2.020e-04
===================================================================================================================================
Date (UTC) Time IP Address St Freq ppm Skew ppm
Offset L Co Offset sd Rem. corr. Root delay Root disp. Max. error
===================================================================================================================================
2019-08-07 00:24:33 172.19.40.23 2 -14.224 0.047
-1.903e-06 N 5 2.139e-05 8.619e-06 2.019e-04 3.725e-05 1.914e-04
2019-08-07 00:25:37 172.19.40.23 2 -14.234 0.046
-4.439e-06 N 5 1.350e-05 3.645e-06 2.019e-04 4.339e-05 2.162e-04
2019-08-07 00:26:42 172.19.40.23 2 -14.238 0.035
-2.843e-06 N 5 1.316e-05 4.830e-06 1.894e-04 3.526e-05 2.205e-04
2019-08-07 00:27:47 172.19.40.23 2 -14.236 0.033
5.749e-06 N 5 2.028e-05 4.724e-06 1.894e-04 3.931e-05 2.042e-04
2019-08-07 00:28:52 172.19.40.23 2 -14.228 0.033
5.932e-06 N 5 1.725e-05 -9.899e-07 1.894e-04 4.295e-05 2.023e-04
2019-08-07 00:29:57 172.19.40.23 2 -14.223 0.029
2.349e-06 N 5 1.390e-05 -5.072e-06 1.894e-04 4.575e-05 2.119e-04
2019-08-07 00:31:01 172.19.40.23 2 -14.222 0.027
3.561e-07 N 5 1.481e-05 -4.794e-06 1.894e-04 4.746e-05 2.145e-04
2019-08-07 00:32:06 172.19.40.23 2 -14.215 0.030
-1.423e-06 N 5 1.702e-05 -3.948e-06 1.894e-04 4.801e-05 2.141e-04
2019-08-07 00:33:12 172.19.40.23 2 -14.223 0.027
-1.270e-06 N 5 1.622e-05 -2.274e-06 1.894e-04 4.818e-05 2.126e-04
2019-08-07 00:34:16 172.19.40.23 2 -14.229 0.028
-6.191e-06 N 5 2.195e-05 -9.632e-07 1.894e-04 4.953e-05 2.099e-04
2019-08-07 00:35:21 172.19.40.23 2 -14.239 0.029
-3.556e-06 N 5 2.074e-05 4.389e-06 1.894e-04 5.154e-05 2.163e-04
2019-08-07 00:36:26 172.19.40.23 2 -14.242 0.027
-3.236e-06 N 5 2.459e-05 5.913e-06 1.894e-04 5.329e-05 2.212e-04
2019-08-07 00:37:31 172.19.40.23 2 -14.271 0.054
-1.550e-05 N 5 2.247e-05 6.871e-06 2.364e-04 2.002e-05 2.242e-04
2019-08-07 00:38:35 172.19.40.23 2 -14.307 0.054
-6.028e-06 N 5 2.563e-05 7.701e-06 2.349e-04 1.930e-05 2.297e-04
2019-08-07 01:10:33 192.168.10.9 3 -14.307 0.000
-3.306e-04 N 3 2.376e-04 7.130e-09 4.031e-04 3.629e-05 2.183e-03
2019-08-07 01:11:05 192.168.10.9 3 -14.307 0.000
1.134e-05 N 3 2.356e-04 3.254e-04 4.031e-04 4.023e-05 6.010e-04
2019-08-07 01:11:38 192.168.10.9 3 -14.307 0.001
-6.167e-05 N 3 1.305e-04 3.535e-05 3.991e-04 3.588e-05 5.884e-04
2019-08-07 01:12:10 192.168.10.9 3 -14.307 0.003
-1.359e-05 N 3 1.187e-04 4.919e-05 3.991e-04 3.939e-05 3.669e-04
2019-08-07 01:12:43 192.168.10.9 3 -14.308 0.008
-3.672e-05 N 3 5.102e-05 4.059e-05 4.056e-04 3.646e-05 3.368e-04
it seemed it took 16 seconds (the poll period) to switch server from
stratum 3 to stratum 2. However, it took almost 32 minute, or 1918
seconds to switch server from stratum 3 to stratum 2.
I used plug/unplug the interface on 172.19.40.1 network to conduct the test.
Although I know lower stratum server is in favor but when it is
unreachable, it should switch to other reachable server, sometimes
lower stratum.
Regards,
Frank Huang
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