| Re: [chrony-users] chrony (or I210) loses PHC refclock PPS signal? |
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- Subject: Re: [chrony-users] chrony (or I210) loses PHC refclock PPS signal?
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Tue, 29 Mar 2022 09:38:52 +0200
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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
anything.
--
Miroslav Lichvar
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