| RE: [chrony-users] Refclock Integration Advice |
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- To: "chrony-users@xxxxxxxxxxxxxxxxxxxx" <chrony-users@xxxxxxxxxxxxxxxxxxxx>
- Subject: RE: [chrony-users] Refclock Integration Advice
- From: "Chang, Benjamin" <Benjamin.Chang@xxxxxxxxxxxxxxx>
- Date: Mon, 23 Nov 2020 13:38:30 +0000
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- Thread-topic: [chrony-users] Refclock Integration Advice
When I run ppstest and ppswatch, it will successfully print out the pulses.
When I run chronyd -d -d to see, I do see that chrony is giving me the following regarding my PPS:
"2020-11-23T13:33:25Z refclock.c:476:(check_pulse_edge) refclock pulse ignored offset=0.000008103 distance=0.000025204 max_error=0.000010000"
And
"2020-11-23T13:33:23Z refclock_pps.c:150:(pps_poll) PPS sample ignored seq=90552 ts=1606138402.000128212"
Which seems to confirm it throwing/dropping some of my PPS. Is there a reason for this and a way to prevent this? I tried being as detailed in the conf file but adding the field width "0.00002" (20us).
Thank you
Ben Chang
-----Original Message-----
From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Sent: Monday, November 23, 2020 7:07 AM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] Refclock Integration Advice
On Fri, Nov 20, 2020 at 03:25:56PM +0000, Chang, Benjamin wrote:
> Am I forgetting something or misunderstanding something? Is maybe why my PPS so hard to sync to because the pulse is so short?
Too short pulse could definitely be a problem. If you run ppstest on the PPS device, do you see a new sample with each second?
> Do you have any suggestions on how to get chrony to better sync to my system? I did notice it seems to receive packets better when its not selected as a source, but that defeats the whole purpose.
That is odd. You could try building chronyd with the --enable-debug option and running chronyd -d -d to see if chronyd is getting the PPS samples and why it is dropping them. Your NTP server seems to be ok (the reported +/- value), so I don't think this is a problem in locking of the PPS refclock.
--
Miroslav Lichvar
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