NTPsec

Backup/Meinberg

Report generated: Fri Jan 27 10:33:01 2023 UTC
Start Time: Thu Jan 26 10:33:01 2023 UTC
End Time: Fri Jan 27 10:33:01 2023 UTC
Report Period: 1.0 days
Warning: plots clipped

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Local Clock Time/Frequency Offsets

local offset plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Time Offset -161.540 -154.561 -67.613 -2.600 69.320 180.126 190.642 136.933 334.687 49.736 1.050 µs -3.376 11.46
Local Clock Frequency Offset 10.515 10.517 10.562 11.030 11.745 11.832 11.840 1.183 1.315 0.306 11.043 ppm 4.317e+04 1.517e+06

The time and frequency offsets between the ntpd calculated time and the local system clock. Showing frequency offset (red, in parts per million, scale on right) and the time offset (blue, in μs, scale on left). Quick changes in time offset will lead to larger frequency offsets.

These are fields 3 (time) and 4 (frequency) from the loopstats log file.



Local RMS Time Jitter

local jitter plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Time Jitter 0.351 0.438 0.526 0.949 3.884 10.697 12.838 3.358 10.259 1.653 1.476 µs 3.693 19.98

The RMS Jitter of the local clock offset. In other words, how fast the local clock offset is changing.

Lower is better. An ideal system would be a horizontal line at 0μs.

RMS jitter is field 5 in the loopstats log file.



Local RMS Frequency Jitter

local stability plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Frequency Jitter 0.107 0.132 0.224 1.448 7.897 10.492 10.862 7.673 10.360 2.267 2.022 ppb 1.686 6.156

The RMS Frequency Jitter (aka wander) of the local clock's frequency. In other words, how fast the local clock changes frequency.

Lower is better. An ideal clock would be a horizontal line at 0ppm.

RMS Frequency Jitter is field 6 in the loopstats log file.



Local Clock Time Offset Histogram

local offset histogram plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Offset -161.540 -154.561 -67.613 -2.600 69.320 180.126 190.642 136.933 334.687 49.736 1.050 µs -3.376 11.46

The clock offsets of the local clock as a histogram.

The Local Clock Offset is field 3 from the loopstats log file.



Local Temperatures

local temps plot

Local temperatures. These will be site-specific depending upon what temperature sensors you collect data from. Temperature changes affect the local clock crystal frequency and stability. The math of how temperature changes frequency is complex, and also depends on crystal aging. So there is no easy way to correct for it in software. This is the single most important component of frequency drift.

The Local Temperatures are from field 3 from the tempstats log file.



Local Frequency/Temp

local freq temps plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset 10.515 10.517 10.562 11.030 11.745 11.832 11.840 1.183 1.315 0.306 11.043 ppm 4.317e+04 1.517e+06
Temp /dev/sda 42.000 42.000 42.000 44.000 44.000 45.000 45.000 2.000 3.000 0.812 43.596 °C
Temp /dev/sdb 52.000 52.000 52.000 54.000 55.000 56.000 56.000 3.000 4.000 0.972 54.195 °C
Temp /dev/sdc 53.000 53.000 53.000 54.000 56.000 56.000 56.000 3.000 3.000 1.076 54.362 °C
Temp /dev/sdd 59.000 59.000 59.000 61.000 62.000 62.000 62.000 3.000 3.000 0.915 60.906 °C
Temp /dev/sde 41.000 41.000 42.000 44.000 44.000 44.000 44.000 2.000 3.000 0.889 43.369 °C
Temp /dev/sdf 53.000 53.000 53.000 55.000 56.000 56.000 56.000 3.000 3.000 0.911 54.822 °C
Temp LM0 26.500 26.500 26.750 29.000 38.500 38.750 38.750 11.750 12.250 3.170 29.742 °C
Temp LM1 39.500 39.500 40.000 42.000 44.500 45.000 45.000 4.500 5.500 1.268 41.751 °C
Temp LM10 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM11 42.000 42.000 42.000 44.000 44.000 45.000 45.000 2.000 3.000 0.812 43.596 °C
Temp LM12 27.800 27.800 27.800 27.800 27.800 27.800 27.800 0.000 0.000 0.000 27.800 °C
Temp LM13 29.800 29.800 29.800 29.800 29.800 29.800 29.800 0.000 0.000 0.000 29.800 °C
Temp LM14 27.250 27.250 27.500 29.750 35.500 36.000 36.000 8.000 8.750 2.105 30.198 °C
Temp LM15 53.000 53.000 53.000 55.000 56.000 56.000 56.000 3.000 3.000 0.960 54.930 °C
Temp LM16 58.000 58.500 59.000 61.500 65.000 65.000 65.000 6.000 6.500 1.522 61.382 °C
Temp LM17 59.000 59.000 59.000 61.000 62.000 62.000 62.000 3.000 3.000 0.964 61.094 °C
Temp LM18 52.000 52.000 52.000 54.000 55.000 56.000 56.000 3.000 4.000 0.975 54.244 °C
Temp LM19 25.000 26.000 26.000 29.000 60.000 62.000 64.000 34.000 36.000 9.545 31.997 °C
Temp LM2 41.000 41.000 42.000 44.000 44.000 45.000 45.000 2.000 4.000 0.880 43.390 °C
Temp LM20 25.000 25.000 26.000 29.000 52.000 62.000 64.000 26.000 37.000 8.424 31.338 °C
Temp LM21 23.000 23.000 24.000 26.000 55.000 60.000 62.000 31.000 37.000 9.168 28.927 °C
Temp LM22 24.000 25.000 26.000 28.000 57.000 60.000 61.000 31.000 35.000 8.973 30.920 °C
Temp LM23 23.000 24.000 24.000 28.000 52.000 56.000 56.000 28.000 32.000 7.873 29.909 °C
Temp LM3 29.000 29.000 30.000 32.000 37.000 37.000 37.000 7.000 8.000 1.900 32.226 °C
Temp LM4 29.000 29.000 29.500 31.500 35.000 35.500 35.500 5.500 6.500 1.537 31.814 °C
Temp LM5 24.000 24.000 24.000 24.000 24.000 24.000 24.000 0.000 0.000 0.000 24.000 °C
Temp LM6 25.500 25.500 26.000 28.500 59.000 61.500 64.000 33.000 36.000 9.667 31.620 °C
Temp LM7 58.000 58.000 59.000 61.000 65.000 65.000 65.000 6.000 7.000 1.574 61.160 °C
Temp LM8 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM9 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp ZONE0 25.000 25.000 26.000 29.000 60.000 63.000 65.000 34.000 38.000 9.729 31.850 °C
Temp ZONE1 27.800 27.800 27.800 27.800 27.800 27.800 27.800 0.000 0.000 0.000 27.800 °C
Temp ZONE2 58.500 58.500 59.000 61.500 65.000 65.000 65.000 6.000 6.500 1.517 61.395 °C
Temp ZONE3 29.800 29.800 29.800 29.800 29.800 29.800 29.800 0.000 0.000 0.000 29.800 °C

The frequency offsets and temperatures. Showing frequency offset (red, in parts per million, scale on right) and the temperatures.

These are field 4 (frequency) from the loopstats log file, and field 3 from the tempstats log file.



Server Offsets

peer offsets plot

The offset of all refclocks and servers. This can be useful to see if offset changes are happening in a single clock or all clocks together.

Clock Offset is field 5 in the peerstats log file.



Server Offset 2001:470:e815::8 (spidey.rellim.com)

peer offset 2001:470:e815::8 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1.112 -1.021 -0.897 -0.065 1.436 1.547 1.597 2.333 2.568 0.592 0.011 ms -3.019 7.18

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.1

peer offset 204.17.205.1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.1 -2.464 -2.313 -1.549 0.116 1.682 1.990 2.070 3.231 4.303 0.901 -0.008 ms -4.2 11.19

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.17

peer offset 204.17.205.17 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.17 -113.468 -83.101 -44.086 33.583 111.034 205.856 257.783 155.120 288.957 47.296 33.908 µs -0.204 5.777

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.23

peer offset 204.17.205.23 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.23 -168.120 -126.873 -64.531 21.922 118.188 237.141 257.174 182.719 364.014 57.667 27.537 µs -0.9829 6.32

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.24

peer offset 204.17.205.24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.24 -162.632 -129.912 -54.065 26.856 139.318 233.174 244.903 193.383 363.086 60.320 30.672 µs -0.9126 5.563

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.27

peer offset 204.17.205.27 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.27 -434.480 -91.071 -32.328 37.985 98.310 327.368 426.209 130.638 418.439 62.605 38.850 µs 0.2533 18.74

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset SHM(0)

peer offset SHM(0) plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset SHM(0) -161.541 -154.562 -67.614 -2.600 69.321 180.127 190.643 136.935 334.689 49.736 1.050 µs -3.376 11.46

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Jitters

peer jitters plot

The RMS Jitter of all refclocks and servers. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 2001:470:e815::8 (spidey.rellim.com)

peer jitter 2001:470:e815::8 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 3.478 4.097 5.801 15.301 43.060 59.249 72.065 37.259 55.152 11.643 18.255 µs 3.514 11.74

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.1

peer jitter 204.17.205.1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.1 1.767 5.275 7.105 19.078 83.391 161.887 174.684 76.286 156.612 27.956 27.438 µs 3.003 13.22

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.17

peer jitter 204.17.205.17 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.17 3.951 4.794 7.454 22.313 52.909 68.961 85.557 45.455 64.167 13.906 24.847 µs 3.963 12.15

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.23

peer jitter 204.17.205.23 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.23 1.446 2.875 4.003 15.668 45.723 70.554 83.256 41.720 67.679 14.099 19.163 µs 2.571 8.311

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.24

peer jitter 204.17.205.24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.24 1.440 1.923 3.176 15.707 52.443 68.510 97.811 49.267 66.587 15.592 19.385 µs 2.11 6.601

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.27

peer jitter 204.17.205.27 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.27 0.000 3.383 5.067 14.434 60.060 129.238 449.863 54.993 125.855 31.723 21.899 µs 6.795 78.32

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter SHM(0)

peer jitter SHM(0) plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter SHM(0) 0.284 0.401 0.671 2.660 13.875 51.781 72.588 13.204 51.380 7.733 4.743 µs 4.087 29.57

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Summary


Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset 10.515 10.517 10.562 11.030 11.745 11.832 11.840 1.183 1.315 0.306 11.043 ppm 4.317e+04 1.517e+06
Local Clock Time Offset -161.540 -154.561 -67.613 -2.600 69.320 180.126 190.642 136.933 334.687 49.736 1.050 µs -3.376 11.46
Local RMS Frequency Jitter 0.107 0.132 0.224 1.448 7.897 10.492 10.862 7.673 10.360 2.267 2.022 ppb 1.686 6.156
Local RMS Time Jitter 0.351 0.438 0.526 0.949 3.884 10.697 12.838 3.358 10.259 1.653 1.476 µs 3.693 19.98
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 3.478 4.097 5.801 15.301 43.060 59.249 72.065 37.259 55.152 11.643 18.255 µs 3.514 11.74
Server Jitter 204.17.205.1 1.767 5.275 7.105 19.078 83.391 161.887 174.684 76.286 156.612 27.956 27.438 µs 3.003 13.22
Server Jitter 204.17.205.17 3.951 4.794 7.454 22.313 52.909 68.961 85.557 45.455 64.167 13.906 24.847 µs 3.963 12.15
Server Jitter 204.17.205.23 1.446 2.875 4.003 15.668 45.723 70.554 83.256 41.720 67.679 14.099 19.163 µs 2.571 8.311
Server Jitter 204.17.205.24 1.440 1.923 3.176 15.707 52.443 68.510 97.811 49.267 66.587 15.592 19.385 µs 2.11 6.601
Server Jitter 204.17.205.27 0.000 3.383 5.067 14.434 60.060 129.238 449.863 54.993 125.855 31.723 21.899 µs 6.795 78.32
Server Jitter SHM(0) 0.284 0.401 0.671 2.660 13.875 51.781 72.588 13.204 51.380 7.733 4.743 µs 4.087 29.57
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1.112 -1.021 -0.897 -0.065 1.436 1.547 1.597 2.333 2.568 0.592 0.011 ms -3.019 7.18
Server Offset 204.17.205.1 -2.464 -2.313 -1.549 0.116 1.682 1.990 2.070 3.231 4.303 0.901 -0.008 ms -4.2 11.19
Server Offset 204.17.205.17 -113.468 -83.101 -44.086 33.583 111.034 205.856 257.783 155.120 288.957 47.296 33.908 µs -0.204 5.777
Server Offset 204.17.205.23 -168.120 -126.873 -64.531 21.922 118.188 237.141 257.174 182.719 364.014 57.667 27.537 µs -0.9829 6.32
Server Offset 204.17.205.24 -162.632 -129.912 -54.065 26.856 139.318 233.174 244.903 193.383 363.086 60.320 30.672 µs -0.9126 5.563
Server Offset 204.17.205.27 -434.480 -91.071 -32.328 37.985 98.310 327.368 426.209 130.638 418.439 62.605 38.850 µs 0.2533 18.74
Server Offset SHM(0) -161.541 -154.562 -67.614 -2.600 69.321 180.127 190.643 136.935 334.689 49.736 1.050 µs -3.376 11.46
Temp /dev/sda 42.000 42.000 42.000 44.000 44.000 45.000 45.000 2.000 3.000 0.812 43.596 °C
Temp /dev/sdb 52.000 52.000 52.000 54.000 55.000 56.000 56.000 3.000 4.000 0.972 54.195 °C
Temp /dev/sdc 53.000 53.000 53.000 54.000 56.000 56.000 56.000 3.000 3.000 1.076 54.362 °C
Temp /dev/sdd 59.000 59.000 59.000 61.000 62.000 62.000 62.000 3.000 3.000 0.915 60.906 °C
Temp /dev/sde 41.000 41.000 42.000 44.000 44.000 44.000 44.000 2.000 3.000 0.889 43.369 °C
Temp /dev/sdf 53.000 53.000 53.000 55.000 56.000 56.000 56.000 3.000 3.000 0.911 54.822 °C
Temp LM0 26.500 26.500 26.750 29.000 38.500 38.750 38.750 11.750 12.250 3.170 29.742 °C
Temp LM1 39.500 39.500 40.000 42.000 44.500 45.000 45.000 4.500 5.500 1.268 41.751 °C
Temp LM10 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM11 42.000 42.000 42.000 44.000 44.000 45.000 45.000 2.000 3.000 0.812 43.596 °C
Temp LM12 27.800 27.800 27.800 27.800 27.800 27.800 27.800 0.000 0.000 0.000 27.800 °C
Temp LM13 29.800 29.800 29.800 29.800 29.800 29.800 29.800 0.000 0.000 0.000 29.800 °C
Temp LM14 27.250 27.250 27.500 29.750 35.500 36.000 36.000 8.000 8.750 2.105 30.198 °C
Temp LM15 53.000 53.000 53.000 55.000 56.000 56.000 56.000 3.000 3.000 0.960 54.930 °C
Temp LM16 58.000 58.500 59.000 61.500 65.000 65.000 65.000 6.000 6.500 1.522 61.382 °C
Temp LM17 59.000 59.000 59.000 61.000 62.000 62.000 62.000 3.000 3.000 0.964 61.094 °C
Temp LM18 52.000 52.000 52.000 54.000 55.000 56.000 56.000 3.000 4.000 0.975 54.244 °C
Temp LM19 25.000 26.000 26.000 29.000 60.000 62.000 64.000 34.000 36.000 9.545 31.997 °C
Temp LM2 41.000 41.000 42.000 44.000 44.000 45.000 45.000 2.000 4.000 0.880 43.390 °C
Temp LM20 25.000 25.000 26.000 29.000 52.000 62.000 64.000 26.000 37.000 8.424 31.338 °C
Temp LM21 23.000 23.000 24.000 26.000 55.000 60.000 62.000 31.000 37.000 9.168 28.927 °C
Temp LM22 24.000 25.000 26.000 28.000 57.000 60.000 61.000 31.000 35.000 8.973 30.920 °C
Temp LM23 23.000 24.000 24.000 28.000 52.000 56.000 56.000 28.000 32.000 7.873 29.909 °C
Temp LM3 29.000 29.000 30.000 32.000 37.000 37.000 37.000 7.000 8.000 1.900 32.226 °C
Temp LM4 29.000 29.000 29.500 31.500 35.000 35.500 35.500 5.500 6.500 1.537 31.814 °C
Temp LM5 24.000 24.000 24.000 24.000 24.000 24.000 24.000 0.000 0.000 0.000 24.000 °C
Temp LM6 25.500 25.500 26.000 28.500 59.000 61.500 64.000 33.000 36.000 9.667 31.620 °C
Temp LM7 58.000 58.000 59.000 61.000 65.000 65.000 65.000 6.000 7.000 1.574 61.160 °C
Temp LM8 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM9 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp ZONE0 25.000 25.000 26.000 29.000 60.000 63.000 65.000 34.000 38.000 9.729 31.850 °C
Temp ZONE1 27.800 27.800 27.800 27.800 27.800 27.800 27.800 0.000 0.000 0.000 27.800 °C
Temp ZONE2 58.500 58.500 59.000 61.500 65.000 65.000 65.000 6.000 6.500 1.517 61.395 °C
Temp ZONE3 29.800 29.800 29.800 29.800 29.800 29.800 29.800 0.000 0.000 0.000 29.800 °C
Summary as CSV file


This server:

CPU: Quad core Intel Xeon E3-1241 v3
Kernel: config.gz
Motherboard: Supermicro X10SAE
OS: Gentoo stable
GPS; Meinberg GPS180PEX
GPS/PPS server: gpsd
NTP server: NTPsec
ntp.conf: current
ntp.log: current

Notes:

Notes:
03:20Z 20 Dec 2018 Change poll from 8s to 4s.  4s seems best.
01:30Z 20 Dec 2018 Change poll from 2s to 8s.
23:00Z 20 Dec 2018 Change poll from 4s to 2s.
22:00Z 20 Dec 2018 Change poll from 64s to 4s.
21:40  19 Dec 2018 -- just started

Poll:
64s   SHM(0) offset StdDev 34.5 us, jitter 5.3 us
8s    8s better jitter than 4s, but worse offset than 4s
4s    SHM(0) offset mean 0 ns StdDev 481 ns, jitter 449 ns StdDev 250 ns
      better than 2s, almost unstable
2s    




Glossary:

frequency offset:
The difference between the ntpd calculated frequency and the local system clock frequency (usually in parts per million, ppm)
jitter, dispersion:
The short term change in a value. NTP measures Local Time Jitter, Refclock Jitter, and Server Jitter in seconds. Local Frequency Jitter is in ppm or ppb.
kurtosis, Kurt:
The kurtosis of a random variable X is the fourth standardized moment and is a dimension-less ratio. ntpviz uses the Pearson's moment coefficient of kurtosis. A normal distribution has a kurtosis of three. NIST describes a kurtosis over three as "heavy tailed" and one under three as "light tailed".
ms, millisecond:
One thousandth of a second = 0.001 seconds, 1e-3 seconds
mu, mean:
The arithmetic mean: the sum of all the values divided by the number of values. The formula for mu is: "mu = (∑xi) / N". Where xi denotes the data points and N is the number of data points.
ns, nanosecond:
One billionth of a second, also one thousandth of a microsecond, 0.000000001 seconds and 1e-9 seconds.
percentile:
The value below which a given percentage of values fall.
ppb, parts per billion:
Ratio between two values. These following are all the same: 1 ppb, one in one billion, 1/1,000,000,000, 0.000,000,001, 1e-9 and 0.000,000,1%
ppm, parts per million:
Ratio between two values. These following are all the same: 1 ppm, one in one million, 1/1,000,000, 0.000,001, and 0.000,1%
‰, parts per thousand:
Ratio between two values. These following are all the same: 1 ‰. one in one thousand, 1/1,000, 0.001, and 0.1%
refclock:
Reference clock, a local GPS module or other local source of time.
remote clock:
Any clock reached over the network, LAN or WAN. Also called a peer or server.
time offset:
The difference between the ntpd calculated time and the local system clock's time. Also called phase offset.
σ, sigma:
Sigma denotes the standard deviation (SD) and is centered on the arithmetic mean of the data set. The SD is simply the square root of the variance of the data set. Two sigma is simply twice the standard deviation. Three sigma is three times sigma. Smaller is better.
The formula for sigma is: "σ = √[ ∑(xi-mu)^2 / N ]". Where xi denotes the data points and N is the number of data points.
skewness, Skew:
The skewness of a random variable X is the third standardized moment and is a dimension-less ratio. ntpviz uses the Pearson's moment coefficient of skewness. Wikipedia describes it best: "The qualitative interpretation of the skew is complicated and unintuitive."
A normal distribution has a skewness of zero.
upstream clock:
Any server or reference clock used as a source of time.
µs, us, microsecond:
One millionth of a second, also one thousandth of a millisecond, 0.000,001 seconds, and 1e-6 seconds.



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