| 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 13:52:05 +0000
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- Thread-topic: [chrony-users] Refclock Integration Advice
Even with my vi file being just "refclock PPS /dev/pps2 refid NTPS poll 0 prefer" for the refclock, I get the
"2020-11-23T13:52:45Z refclock_pps.c:150:(pps_poll) PPS sample ignored seq=91133 ts=1606139562.000006448"
I tried my refclock also just being "refclock PPS /dev/pps2 refid NTPS prefer" to get the same result.
"2020-11-23T13:55:33Z refclock_pps.c:150:(pps_poll) PPS sample ignored seq=91161 ts=1606139732.000032552"
-----Original Message-----
From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
Sent: Monday, November 23, 2020 8:44 AM
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] Refclock Integration Advice
On Mon, Nov 23, 2020 at 01:38:30PM +0000, Chang, Benjamin wrote:
> 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).
The width option reduces the maximum allowed error, as is described in the man page. What do you get when you drop the option?
--
Miroslav Lichvar
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