[time-nuts] Graphs
Hal Murray
hmurray at megapathdsl.net
Mon Jan 2 12:09:57 UTC 2017
Here is data from a system using Google's NTP servers.
http://users.megapathdsl.net/~hmurray/time-nuts/leap/ntp-goog-leap.png
The Offset is the view from another system. The drift is from the system
itself.
Google said 13.9 uSec/sec. That matches the step in the drift.
Note the overshoot at the end of the smear. It's about 50 ms. There is a
similar blip at the start of the smear, but it's harder to see when it's
riding on top of the sloped line.
The NIST UT1 server smeared the second over a whole day. ??
http://users.megapathdsl.net/~hmurray/time-nuts/leap/UT1-SF-leap.png
Somebody asked about systems that "freeze" the clock for a second. Linux,
NetBSD, and FreeBSD all stepped the clock back. An OpenBSD system was off by
a second for about 4 hours.
--
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