Re: [chrony-users] chrony (or I210) loses PHC refclock PPS signal?

[ Thread Index | Date Index | More Archives ]

On Sat, Mar 26, 2022 at 09:59:52PM +0100, Fabian wrote:
> I think I might have found the problem, but unsure on how to fix that.
> In the room there is a fluorescent lamp, whenever someone switches on the
> light, there is a chance the PPS input on the card will stop.

How long is the cable and is it electrically terminated?

I have seen the PPS timestamping on I210 to randomly stop working when
reconnecting between different GPS units. I suspect it happens when
the hardware gets multiple pulses too close to each other. I can
reproduce it by configuring the GPS with the CFG-TP5 command to
generate pulses at a very high rate.

There seem to be two different failure modes. With one it is sufficient
to restart chronyd, but the other one requires reloading of the driver.
I looked at the driver source code for any clues, but didn't see

Miroslav Lichvar

To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx 
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx 
with "help" in the subject.
Trouble?  Email listmaster@xxxxxxxxxxxxxxxxxxxx.

Mail converted by MHonArc 2.6.19+