[time-nuts] Leap second glitches on NTP using Z3801A
Hal Murray
hmurray at megapathdsl.net
Mon Nov 17 03:21:42 UTC 2008
Is anybody running ntpd with their Z3801A?
If so, please check your log files and tell me if you see a bogus leap second
at the end of the past several months. I've seen them for Aug, Sep, and Oct.
I think they are coming from my Z3801A, but it might be something else.
The GPS satellites are now announcing a leap second that will happen at the
end of the year. The refclock driver passes that to ntpd and ntpd passes it
to the kernel and magic happens.
I think the refclock-ntpd interface assumes the leap second will happen at
the end of the current month. NIST only announces leap seconds a month ahead
on WWVB and ACTS.
The Oncore refclock driver has a filter to wait until the current month to
pass the info to ntpd. I'm working on something similar for the HP driver.
--
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