Re: [chrony-users] PPS correction not being applied

[Brian Gieryk <ke6iyc@xxxxxxx>]

Recent snipet from refclocks.log


===============================================================================
  Date (UTC) Time         Refid  DP L P  Raw offset   Cooked offset      Disp.
===============================================================================
2017-02-24 15:20:01.987157 GPS    10 N 0  1.375465e-02  1.284218e-02  1.000e-01
2017-02-24 15:20:03.007568 GPS    11 N 0 -6.695705e-03 -7.568935e-03  1.000e-01
2017-02-24 15:20:04.006286 GPS    12 N 0 -5.451906e-03 -6.286731e-03  1.000e-01
2017-02-24 15:20:04.987341 GPS    13 N 0  1.345536e-02  1.265826e-02  1.000e-01
2017-02-24 15:20:05.981351 GPS    14 N 0  1.940777e-02  1.864889e-02  1.000e-01
2017-02-24 15:20:07.017450 GPS    15 N 0 -1.673142e-02 -1.745045e-02  1.000e-01
2017-02-24 15:19:58.797466 GPS     - N -       -        2.533224e-03  1.000e-01
2017-02-24 15:20:08.004129 GPS     0 N 0 -1.242240e-03 -4.129600e-03  1.000e-01
2017-02-24 15:20:09.003884 GPS     1 N 0 -1.233461e-03 -3.884212e-03  1.000e-01
2017-02-24 15:20:10.016937 GPS     2 N 0 -1.452626e-02 -1.693726e-02  1.000e-01
2017-02-24 15:20:10.991004 GPS     3 N 0  1.117600e-02  8.995530e-03  1.000e-01
2017-02-24 15:20:11.990037 GPS     4 N 0  1.190633e-02  9.962303e-03  1.000e-01
2017-02-24 15:20:13.020436 GPS     5 N 0 -1.873611e-02 -2.043628e-02  1.000e-01
2017-02-24 15:20:13.990162 GPS     6 N 0  1.130804e-02  9.837376e-03  1.000e-01
2017-02-24 15:20:15.010200 GPS     7 N 0 -8.971401e-03 -1.020066e-02  1.000e-01
2017-02-24 15:20:15.984244 GPS     8 N 0  1.675461e-02  1.575588e-02  1.000e-01
2017-02-24 15:20:17.004312 GPS     9 N 0 -3.555564e-03 -4.312879e-03  1.000e-01
2017-02-24 15:20:18.004689 GPS    10 N 0 -4.168469e-03 -4.689028e-03  1.000e-01
2017-02-24 15:20:19.020420 GPS    11 N 0 -2.014009e-02 -2.042026e-02  1.000e-01
2017-02-24 15:20:20.010434 GPS    12 N 0 -1.043449e-02 -1.043431e-02  1.000e-01
2017-02-24 15:20:21.016526 GPS    13 N 0 -1.652631e-02 -1.652613e-02  1.000e-01
2017-02-24 15:20:21.984592 GPS    14 N 0  1.540710e-02  1.540728e-02  1.000e-01
2017-02-24 15:20:23.005002 GPS    15 N 0 -5.002770e-03 -5.002588e-03  1.000e-01
2017-02-24 15:20:15.604034 GPS     - N -       -       -4.034649e-03  1.000e-01
2017-02-24 15:20:24.008004 GPS     0 N 0 -9.683123e-03 -8.004299e-03  1.000e-01
2017-02-24 15:20:25.025063 GPS     1 N 0 -2.666452e-02 -2.506397e-02  1.000e-01
2017-02-24 15:20:26.015081 GPS     2 N 0 -1.660632e-02 -1.508197e-02  1.000e-01
2017-02-24 15:20:27.015129 GPS     3 N 0 -1.657705e-02 -1.512967e-02  1.000e-01
2017-02-24 15:20:27.983524 GPS     4 N 0  1.510218e-02  1.647503e-02  1.000e-01
2017-02-24 15:20:28.988274 GPS     5 N 0  1.043042e-02  1.172593e-02  1.000e-01
2017-02-24 15:20:29.983295 GPS     6 N 0  1.548592e-02  1.670486e-02  1.000e-01
2017-02-24 15:20:31.000392 GPS     7 N 0 -1.533493e-03 -3.928390e-04  1.000e-01
===============================================================================
  Date (UTC) Time         Refid  DP L P  Raw offset   Cooked offset      Disp.
===============================================================================
2017-02-24 15:20:31.983413 GPS     8 N 0  1.552176e-02  1.658675e-02  1.000e-01
2017-02-24 15:20:32.962769 GPS     9 N 0  3.624121e-02  3.723083e-02  1.000e-01
2017-02-24 15:20:33.988544 GPS    10 N 0  1.054480e-02  1.145547e-02  1.000e-01
2017-02-24 15:20:34.988592 GPS    11 N 0  1.057412e-02  1.140782e-02  1.000e-01
2017-02-24 15:20:35.988681 GPS    12 N 0  1.056225e-02  1.131898e-02  1.000e-01
2017-02-24 15:20:36.998711 GPS    13 N 0  6.091520e-04  1.288145e-03  1.000e-01
2017-02-24 15:20:37.964039 GPS    14 N 0  3.535536e-02  3.596006e-02  1.000e-01
2017-02-24 15:20:38.988797 GPS    15 N 0  1.067647e-02  1.120229e-02  1.000e-01
2017-02-24 15:20:32.491693 GPS     - N -       -        8.306328e-03  1.000e-01
2017-02-24 15:20:39.994004 GPS     0 N 0  1.046571e-02  5.995506e-03  1.000e-01
2017-02-24 15:20:40.994121 GPS     1 N 0  9.877895e-03  5.878899e-03  1.000e-01
2017-02-24 15:20:41.994145 GPS     2 N 0  9.382104e-03  5.854275e-03  1.000e-01
2017-02-24 15:20:43.003612 GPS     3 N 0 -5.606230e-04 -3.612836e-03  1.000e-01
2017-02-24 15:20:43.993340 GPS     4 N 0  9.245389e-03  6.659491e-03  1.000e-01
2017-02-24 15:20:44.979309 GPS     5 N 0  2.281177e-02  2.069042e-02  1.000e-01
2017-02-24 15:20:45.979376 GPS     6 N 0  2.227403e-02  2.062386e-02  1.000e-01
2017-02-24 15:20:46.979469 GPS     7 N 0  2.170914e-02  2.053017e-02  1.000e-01
2017-02-24 15:20:47.975818 GPS     8 N 0  2.489076e-02  2.418123e-02  1.000e-01
2017-02-24 15:20:48.998301 GPS     9 N 0  1.697528e-03  1.698060e-03  1.000e-01
2017-02-24 15:20:49.968538 GPS    10 N 0  3.146090e-02  3.146143e-02  1.000e-01
2017-02-24 15:20:50.988606 GPS    11 N 0  1.139313e-02  1.139366e-02  1.000e-01
2017-02-24 15:20:51.989674 GPS    12 N 0  1.032455e-02  1.032508e-02  1.000e-01
2017-02-24 15:20:52.995053 GPS    13 N 0  4.946263e-03  4.946795e-03  1.000e-01
2017-02-24 15:20:53.994809 GPS    14 N 0  5.190453e-03  5.190985e-03  1.000e-01
2017-02-24 15:20:54.998813 GPS    15 N 0  1.185920e-03  1.186452e-03  1.000e-01
2017-02-24 15:20:46.990260 GPS     - N -       -        9.739873e-03  1.000e-01
2017-02-24 15:20:55.983874 GPS     0 N 0  2.454278e-02  1.612560e-02  1.000e-01
2017-02-24 15:20:57.002943 GPS     1 N 0  4.242812e-03 -2.943432e-03  1.000e-01
2017-02-24 15:20:58.003534 GPS     2 N 0  2.442725e-03 -3.534903e-03  1.000e-01
2017-02-24 15:20:58.998015 GPS     3 N 0  6.760802e-03  1.984408e-03  1.000e-01
2017-02-24 15:20:59.998056 GPS     4 N 0  5.511664e-03  1.943221e-03  1.000e-01
2017-02-24 15:21:01.013240 GPS     5 N 0 -1.089818e-02 -1.324038e-02  1.000e-01
===============================================================================
  Date (UTC) Time         Refid  DP L P  Raw offset   Cooked offset      Disp.
===============================================================================
2017-02-24 15:21:01.989195 GPS     6 N 0  1.196806e-02  1.080472e-02  1.000e-01
2017-02-24 15:21:03.009589 GPS     7 N 0 -9.589934e-03 -9.589271e-03  1.000e-01
2017-02-24 15:21:04.009321 GPS     8 N 0 -9.322357e-03 -9.321694e-03  1.000e-01
2017-02-24 15:21:04.983406 GPS     9 N 0  1.659283e-02  1.659349e-02  1.000e-01
2017-02-24 15:21:06.008378 GPS    10 N 0 -8.378905e-03 -8.378242e-03  1.000e-01
2017-02-24 15:21:07.019457 GPS    11 N 0 -1.945806e-02 -1.945740e-02
1.000e-01


Brian



Sent from my iPhone

>> On Feb 24, 2017, at 01:34, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
>> 
>> On Fri, Feb 24, 2017 at 12:00:42AM -0800, Bill Unruh wrote:
>> You are not logging a crucial thing, refclocks logging.
>> Put refclocks into the logging line in chrony.conf
>> 
>> 
>> Note-- it is pps that gines the accuracy. And you need to lock PPS to a
>> working other source of inaccurate time (better than seconds)
> 
> It would be also good to know what GPS receiver is it. Maybe it
> doesn't have PPS or it is not working? gpsd prints some useful
> messages in the debug mode. E.g.
> 
> gpsd -n -N /dev/ttyS0 -D 9 2>&1 | grep PPS
> 
> Anyway, there are several options when configuring chrony to use GPS
> with gpsd. I think the best options are:
> 
> A) refclock SHM 1
> 
> B) refclock SOCK /var/run/chrony.ttyS0.sock
> 
> C) refclock SHM 0 refid NMEA noselect
>  refclock PPS /dev/pps0 lock NMEA
> 
> Only one should be used at a time. B requires chronyd to be started
> before gpsd. C requires gpsd (or ldattach) to be started before
> chronyd. In A the order doesn't matter.
> 
> -- 
> Miroslav Lichvar
> 
> -- 
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