NTPsec leap second experience

[Achim Gratz]

I've kept to rasPi running through the leap second.

The first was following the PTB servers as a stratum2 and monitoring
both a DCF77 and a GPS (via USB).  This one correctly announced the leap
second and kept the time.

The second one was configured as a stratum1 (via GPS w/ PPS) and
monitoring the PTB servers for reference.  Since apparently Jessie has
not been updated with the correct leap second file (it still doesn't
recognize the leap second as a valid datum), the GPS got marked as a
falseticker when the leapsecond arrived and the NTP loop opened.  I've
arrived back home almost two days later to restart NTP.  I keep that
system at a temperature that has close to zero TC (I'm not regulating
the temperature yet, but it seems that should be possible) and during my
absence the room temperature was also quite stable.  Accordingly the
clock had only drifted a little bit less than 1ms (I recorded all PPS
time stamps).  It probably would have drifted even less if there hadn't
been a GPS burp shortly before the leap second and the loop hadn't
stabilised to the correct offset again.



Regards,
Achim.
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