Minor NTP question ....

["William A. Mahaffey III" <wam%hiwaay.net@localhost>]

.... I have a RPiB+ on my LAN serving as the timekeeper for the LAN, 
running NetBSD-7 from a few weeks ago, working AOK. In my scenario, I am 
unhooked from the internet for periods of hours, always overnight, 
sometimes during the day as well. When I reconnect after these outages & 
look at 'ntpq -pn' output after a few min. when ntpd has redisvocered 
that the internet is back & goes back to syncing w/ my ISP, it is 
usually 6-10 sec. off. After a few hours, this is down to ~0.2 sec. or 
less, so all is well, however, I thought that when ntpd had settled in 
on a good drift value, it could coast for some time w/o getting too far 
off from its time source. I.e., I expect it to be maybe 1 sec. off after 
an outage, not 6-10 sec. Am I understanding things correctly ? Some data 
below:


rpi # ntpq -pn
     remote           refid      st t when poll reach   delay offset  
jitter
==============================================================================
 127.127.1.0     .MSCF.           4 l 154m   64    0    0.000 0.000   0.000
*216.180.54.1    98.143.24.53     3 u   34  256  377   16.222 -1.806   2.080
rpi # uname -a
NetBSD rpi 7.0_BETA NetBSD 7.0_BETA (RPI.201503272230Z) evbarm
rpi #


This is not a huge issue, since all LAN machines are kept well synced w/ 
the timekeeper & each-other, but it is curious (at least to me), so I'm 
asking. TIA & have a good one ....

--

	William A. Mahaffey III

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