| Re: [chrony-users] Two nearly identical boxes behaving differently |
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On Fri, Nov 10, 2017 at 03:39:13AM +1100, Paul J R wrote:
> The config on both is identical:
>
> refclock SHM 0 offset 0.395 delay 0.2 refid NMEA noselect
> refclock PPS /dev/pps0 refid PPS poll 4 prefer lock NMEA
> server 10.69.69.1
>
> One cant seem to poll pps:
>
> root@ntp03:~# chronyc sources
> 210 Number of sources = 3
> MS Name/IP address Stratum Poll Reach LastRx Last sample
> ===============================================================================
> #? NMEA 0 4 377 10 -264ms[ -264ms] +/-
> 110ms
> #? PPS 0 4 0 - +0ns[ +0ns] +/- 0ns
> ^* 10.69.69.1 2 6 177 46 -4689ns[ -14us] +/-
> 92ms
The offset of the NMEA source is probably too large to be locked with
the PPS. You will need to adjust the offset value on the SHM line to
bring it closer to UTC and allow PPS to lock.
> And the other cant poll the server:
>
> root@ntp04:~# chronyc sources
> 210 Number of sources = 3
> MS Name/IP address Stratum Poll Reach LastRx Last sample
> ===============================================================================
> #? NMEA 0 4 377 19 -24ms[ -24ms] +/-
> 105ms
> #* PPS 0 4 277 18 +39ns[ -5ns] +/-
> 56ns
> ^? 10.69.69.1 0 7 377 - +0ns[ +0ns] +/-
> 0ns
As a first step, it would be good to confirm that the server is
responding. tcpdump-mini would be a good tool for that. :) If it does
respond, then a second step would be to recompile chrony with
debugging enabled, run chronyd with -d -d and see if there is
anything interesting.
--
Miroslav Lichvar
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