Re: [chrony-users] GPS / Chrony NTP server config questions

I rebuilt chrony with --enable-debug and ran with -d -d Below is some output although I'm not 100% sure what it means. Tried looking at the source code to see if I could ascertain the cause but I was unable. I let it run for a bit and here's some sample output. The pattern just seems to repeat over and over.

2017-11-14T20:34:08Z refclock.c:765:(filter_add_sample) filter sample 0 t=1510691647.698064095 offset=-0.198064096 dispersion=0.000001833

2017-11-14T20:34:08Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003574796 sync=0 dist=1.500000000

2017-11-14T20:34:09Z refclock.c:765:(filter_add_sample) filter sample 1 t=1510691649.560963143 offset=-0.060963144 dispersion=0.000001833

2017-11-14T20:34:09Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003580218 sync=0 dist=1.500000000

2017-11-14T20:34:10Z refclock_shm.c:104:(shm_poll) SHM sample ignored mode=1 count=1202298 valid=0

2017-11-14T20:34:10Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003583732 sync=0 dist=1.500000000

2017-11-14T20:34:11Z refclock.c:765:(filter_add_sample) filter sample 2 t=1510691651.549839364 offset=-0.049839365 dispersion=0.000001833

2017-11-14T20:34:11Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003582173 sync=0 dist=1.500000000

2017-11-14T20:34:12Z refclock_shm.c:104:(shm_poll) SHM sample ignored mode=1 count=1202302 valid=0

2017-11-14T20:34:12Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003574833 sync=0 dist=1.500000000

2017-11-14T20:34:13Z refclock.c:765:(filter_add_sample) filter sample 3 t=1510691653.564970804 offset=-0.064970805 dispersion=0.000001833

2017-11-14T20:34:13Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003576043 sync=0 dist=1.500000000

2017-11-14T20:34:14Z refclock_shm.c:104:(shm_poll) SHM sample ignored mode=1 count=1202306 valid=0

2017-11-14T20:34:14Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003574430 sync=0 dist=1.500000000

2017-11-14T20:34:15Z refclock.c:765:(filter_add_sample) filter sample 4 t=1510691654.612400335 offset=-0.112400336 dispersion=0.000001833

2017-11-14T20:34:15Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003573701 sync=0 dist=1.500000000

2017-11-14T20:34:16Z refclock.c:765:(filter_add_sample) filter sample 5 t=1510691656.599152919 offset=-0.099152920 dispersion=0.000001833

2017-11-14T20:34:16Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003564191 sync=0 dist=1.500000000

2017-11-14T20:34:17Z refclock.c:765:(filter_add_sample) filter sample 6 t=1510691657.519233732 offset=-0.019233733 dispersion=0.000001833

2017-11-14T20:34:17Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003540440 sync=0 dist=1.500000000

2017-11-14T20:34:18Z refclock.c:765:(filter_add_sample) filter sample 7 t=1510691658.565950335 offset=-0.065950336 dispersion=0.000001833

2017-11-14T20:34:18Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003555990 sync=0 dist=1.500000000

2017-11-14T20:34:19Z refclock.c:765:(filter_add_sample) filter sample 8 t=1510691659.612487851 offset=-0.112487852 dispersion=0.000001833

2017-11-14T20:34:19Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003554507 sync=0 dist=1.500000000

2017-11-14T20:34:20Z refclock_shm.c:104:(shm_poll) SHM sample ignored mode=1 count=1202318 valid=0

2017-11-14T20:34:20Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0..003536535 sync=0 dist=1.500000000

2017-11-14T20:34:21Z refclock.c:765:(filter_add_sample) filter sample 9 t=1510691661.556102500 offset=-0.056102501 dispersion=0.000001833

2017-11-14T20:34:21Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003563863 sync=0 dist=1.500000000

2017-11-14T20:34:22Z refclock.c:765:(filter_add_sample) filter sample 10 t=1510691662.603828315 offset=-0.103828316 dispersion=0.000001833

2017-11-14T20:34:22Z refclock.c:520:(RCL_AddCookedPulse) refclock pulse ignored offset=0.003559951 sync=0 dist=1.500000000

2017-11-14T20:34:23Z refclock_shm.c:104:(shm_poll) SHM sample ignored mode=1 count=1202324 valid=0

2017-11-14T20:34:23Z sources.c:356:(SRC_AccumulateSample) ip=[NMEA] t=1510691656.723338336 ofs=0.080481 del=0.200000 disp=0.009623 str=0

2017-11-14T20:34:23Z sourcestats.c:583:(SST_DoNewRegression) off=1.007180e-01 freq=6.636850e-05 skew=3.159318e-04 n=16 bs=0 runs=10 asym=0.000000 arun=0

On Tue, Nov 14, 2017 at 10:36 AM, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:

On Tue, Nov 14, 2017 at 07:40:33AM -0500, Joe Smith wrote:
> Thank you for the quick response Bill... The PPS is coming in on /dev/pps1
> which is what I have in the refclock entry in my chrony.conf file. When run
> the cat command corresponding to that device I get:
>
> debian@beaglebone:~/ntp-gps-server/pps-overlay$ cat
> /sys/devices/virtual/pps/pps1/assert
> 1510661769.997836084#571264

That looks good. The configuration also looks good. I guess the only
thing that could be wrong is the offset value on the SHM line. Does
the machine have an internet connection? It might help if you could
configure it with an NTP server and remove the lock option from PPS to
see if it works that way and to see if the offset of the NMEA source
needs to be adjusted.

If that doesn't work, recompiling chrony with debug support
(--enable-debug) and running chronyd with -d -d should show why it's
ignoring the PPS samples.

--
Miroslav Lichvar

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