Pi3/Uputronics NTP Stats



Last Day Stats   Last Week Stats   24 Hour scatter plots ( 1  2  3)  

Notes:

20:00 13 Aug 2018 UTC Change poll fro 2 to 3 on PPS
                      poll 2 Local Time Clock Offet Std Dev 1.067
05:00 10 Aug 2018 UTC Change pol from 4 to 2 on PPS
                      4 clearly worse than 1
04:00  9 Aug 2018 UTC Change pol from 1 to 4 on PPS
20:00 20 Oct 2016 UTC SD corruption, rolled back to 27 Sep backup...
19:30 26 Sep 2016 UTC minpoll=mapxpoll=1 on PPS
19:30 26 Sep 2016 UTC maxpoll=minpoll=0 results:
                      Local Clock Freq Offset: 90% 1.01 ppm, Jitter 90% 0.65 us
                      Local Stability 90%: 8.24 ppt
                      PPS Offset  90% 1.55 us, Jitter 90% 0.76 us
22:30 23 Sep 2016 UTC minpoll=mapxpoll=0 on PPS
22:30 23 Sep 2016 UTC maxpoll=minpoll=8 results:
                      Local Clock Freq Offset: 90% 886 ppb, Jitter 90% 39.9 us
                      Local Stability 90%: 6.86 ppt
                      PPS Offset  90% 977 us, Jitter 90% 95.2 us
01:10 22 Sep 2016 UTC minpoll=mapxpoll=8 on PPS
01:10 22 Sep 2016 UTC maxpoll=minpoll=7 results:
                      Local Clock Freq Offset: 90% 1.15ppm, Jitter 90% 1.14 us
                      Local Stability 90%: 1.77 ppt
                      PPS Offset  90% 9.48 us, Jitter 90% 3.45 us
21:50 20 Sep 2016 UTC minpoll=mapxpoll=7 on PPS
21:50 20 Sep 2016 UTC maxpoll=minpoll=5 results:
                      Local Clock Freq Offset: 90% 1.36ppm, Jitter 90% 1.34 us
                      Local Stability 90%: 2.64 ppt
                      PPS Offset  90% 11.4us, Jitter 90% 4.43 us
20:35 19 Sep 2016 UTC minpoll=mapxpoll=5 on PPS
20:35 19 Sep 2016 UTC maxpoll=minpoll=4 results:
                      Local Clock Freq Offset: 90% 1.12ppm, Jitter 90% 1.27 us
                      Local Stability 90%: 2.26 ppt
                      PPS Offset  90% 10.3us, Jitter 90% 4.11 us
19:10 18 Sep 2016 UTC minpoll=mapxpoll=4 on PPS
19:10 18 Sep 2016 UTC maxpoll=minpoll=3 results:
                      Local Clock Freq Offset: 90% 0.5ppm, Jitter 90% 0.18 us
                      Local Stability 90%: 1.9 ppt
                      PPS Offset  90% 3.0us, Jitter 90% 0.56 us
19:25 15 Sep 2016 UTC minpoll=mapxpoll=3 on PPS
19:25 15 Sep 2016 UTC maxpoll=minpoll=2 results:
                      Local Clock Freq Offset: 90% 1.1ppm, Jitter 90% 0.08 us
                      Local Stability 90%: 2.9 ppt
                      PPS Offset  90% 2.2us, Jitter 90% 0.20 us
20:00 13 Sep 2016 UTC minpoll=mapxpoll=2 on PPS
20:00 13 Sep 2016 UTC maxpoll=minpoll=1 results:
                      Local Clock Freq Offset: 90% 1.1ppm, Jitter 90% 0.43 us
                      Local Stability 90%: 2.3 ppt
                      PPS Offset  90% 1.6us, Jitter 90% 0.34 us
18:25 12 Sep 2016 UTC minpoll=mapxpoll=1 on PPS
18:20 12 Sep 2016 UTC maxpoll=minpoll=6 results:
                      Local Clock Freq Offset: 90% 1.4ppm, Jitter 90% 3.3 us
                      Local Stability 90%: 2.2 ppt
                      PPS Offset  90% 68us, Jitter 90% 9.7 us
21:00  9 Sep 2016 UTC minpoll=mapxpoll=6 on PPS
22:15 11 Aug 2016 UTC added prefer to SHM(1)
20:30 26 Jul 2016 UTC git head for gpsd and ntpsec
                      kernel 4.4.14 tto 4.4.15, premption server to low latency
01:24 19 Jul 2016 UTC move GPS fudge 0.108 to 0.1085
19:00 15 Jul 2016 UTC move GPS fudge 0.95 to 0.108
          Use new NTPsec reflock config
18:00  1 Jul 2016 UTC, nice the graph creation
          Note, fewer smaller, spikes in Local Clock Time Offset
00:00 30 Jun 2016 UTC add no_hz=off
          Note decreased Local Clock Time offset
               increased RMS time Jitter

This server:

CPU: Rasberry Pi 3
OS: Gentoo stable
Kernel: 4.4.26, Config
GPS; Uputronics GPS HAT
GPS/PPS server: gpsd
NTP server: NTPsec
ntp.conf: current

Many thanks to Uputronics for their support and donation of the GPS.

Poll:

      Local Clock      Local Clock  Local Clock    PPS         PPS
Poll  Freq Offset 90%  Jitter 90%   Stability 90%  Offset 90%  Jitter 90%
0          1.0 ppm        0.65µs       8.2 ppt         1.55µs    0.76µs
1          1.1 ppm        0.43µs       2.3 ppt         1.6µs     0.34µs
2          1.1 ppm        0.08µs       2.9 ppt         2.2µs     0.20µs
3          0.5 ppm        0.18µs       1.9 ppt         3.0µs     0.56µs 
4          1.12ppm        1.27µs       2.26ppt        10.3µs     4.11µs 
5          1.36ppm        1.34µs       2.64ppt        11.4µs     4.43µs 
6          1.4 ppm        3.3 µs       2.2 ppt        68. µs     9.7 µs 
7          1.15ppm        1.14µs       1.77ppt         9.4µs     3.45µs
8          0.89ppm       39.9 µs       6.86ppt       977. µs    95.2 µs


Git repository for chrony-graph: https://github.com/ddrown/chrony-graph