As part of my testing I'm observing the main log, peers, loops, and
clockstats in one window while I observe ntpq (running on a different
machine) polling the server every five seconds. The PPS refclock has
flag4 set so that clockstats are recorded.
What I've noticed is that normally the clockstats is updated once per
second as the PPS ticks. However, during a query by the remote ntpq
instance, the clockstats file pauses for about one second and then
resumes. You can see it below in a direct copy from the clockstats
file. There's a missing 'tick' at 21828 seconds and one at 21832. PPS
is most certainly ticking at these times. It is extremely obvious, when
the two terminal windows are side by side, that the ntpq poll freezes ntpd.
55974 21822.994 127.127.22.0 -0.000033126
55974 21824.099 127.127.22.0 -0.000026711
55974 21825.994 127.127.22.0 -0.000010522
55974 21826.993 127.127.22.0 -0.000039330
55974 21827.994 127.127.22.0 -0.000019143
55974 21829.099 127.127.22.0 -0.000006765
55974 21830.993 127.127.22.0 -0.000023575
55974 21831.993 127.127.22.0 -0.000033386
55974 21833.102 127.127.22.0 -0.000004012
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