Eugen,
It's not a good idea to use ntpdc for precision comparisons; ntpq is
much more useful and truthful.
The display makes no sense. How is it that the GPS and PPS show huge
jitter while the offsets are zero? Take a look with ntpq at
rackety.udel.edu and note the offset and jitter. The jitter should
settle down to the precision limit and the offset should not be much worse.
Dave
Eugen COCA wrote:
Dave,
I have already compiled the kernels with these options. I used FreeBSD
kernel time discipline until now, with this ntpd.conf:
server 127.127.20.1 minpoll 6 maxpoll 6 prefer
fudge 127.127.20.1 flag3 1 time1 0.000
From today morning at 11 o'clock local time, I changed the
configuration to see what's happening:
server 127.127.20.1 minpoll 6 maxpoll 6 prefer
fudge 127.127.20.1 flag3 0 time1 0.000
server 127.127.22.1 minpoll 4 maxpoll 4
fudge 127.127.22.1 flag3 0 time1 0.000
Now, I have no pps sync disabled message, but I have *a lot* of:
Aug 25 20:03:40 ntp1 ntpd[49227]: kernel time sync enabled 2301
Aug 25 20:03:58 ntp1 ntpd[49227]: kernel time sync enabled 2101
from 5 to 30 per hour !
The results seems to be better than before:
https://ecoca.eed.usv.ro/mrtg/time_servers_internet.html
Are there long term statistics collected somewhere ? With ntpdc/dmpeers
I can see:
remote local st poll reach delay offset disp
=======================================================================
.GPS_NMEA(1) 127.0.0.1 0 64 377 0.00000 0.000000 0.03076
ntp3.usv.ro 80.96.120.253 1 64 377 0.00046 0.000016 0.03291
GPS-1.MIT.EDU 80.96.120.253 1 256 377 0.14668 0.000830 0.13341
.ntp2.usv.ro 80.96.120.253 1 64 377 0.00026 -0.000005 0.05095
gps-2.mit.edu 80.96.120.253 1 256 377 0.14603 0.000258 0.09396
ptbtime1.ptb.de 80.96.120.253 1 256 377 0.04810 -0.001051 0.11606
ptbtime2.ptb.de 80.96.120.253 1 256 277 0.04805 0.000228 0.11227
*PPS(1) 127.0.0.1 0 16 377 0.00000 0.000000 0.01576
ntp-p1.obspm.fr 80.96.120.253 1 256 377 0.06244 0.002924 0.10201
ntps1-1.cs.tu-b 80.96.120.253 1 256 277 0.05400 -0.000325 0.07597
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