[ntp:questions] Strange jumps in PPM

A C agcarver+ntp at acarver.net
Wed Aug 21 07:14:57 UTC 2013

On 8/20/2013 23:53, mike cook wrote:
> Le 21 août 2013 à 08:33, mike cook a écrit :
>> Le 21 août 2013 à 08:03, A C a écrit :
>>> Ok, so I saw the below event in the loops on my system which is
>>> controled by ATOM, SHM, and several internet servers.
>>> I suspect it has to do with the GPS PPS output glitching during
>>> extreme satellite events (bad constellation arrangement, fringe
>>> signal, etc.)
>>> Is there a way to have ntpd ignore the PPS quickly if it spins
>>> out of control?  The system recovers fairly quickly and the clock
>>> doesn't go too far out but it would be nice to avoid these
>>> jumps.
> I realize now that I didn't respond to the question :-( .  AFIK there
> are no knobs available to do this. It would be nice to be able to
> specify maximum acceptable offset or jitter by clock.

That would be very useful to have.  I could easily avoid these hiccups 
since they're so wildly different and sudden compared to the normal 

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