NTPsec

Backup/Meinberg

Report generated: Thu Jan 26 16:43:02 2023 UTC
Start Time: Thu Jan 19 16:43:01 2023 UTC
End Time: Thu Jan 26 16:43:01 2023 UTC
Report Period: 7.0 days

Daily stats   Weekly stats  

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 -218.116 -81.350 -38.347 -4.354 52.067 91.495 173.595 90.414 172.845 33.766 0.679 µs -3.889 16.18
Local Clock Frequency Offset 10.305 10.369 10.569 10.960 11.501 11.849 11.866 0.932 1.480 0.269 10.960 ppm 6.303e+04 2.512e+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 0.280 0.406 0.492 0.922 3.337 7.016 19.581 2.845 6.610 1.388 1.356 µs 5.403 47.45

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 0.051 0.109 0.187 1.033 3.430 7.741 12.621 3.243 7.632 1.437 1.477 ppb 2.949 16.86

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 -218.116 -81.350 -38.347 -4.354 52.067 91.495 173.595 90.414 172.845 33.766 0.679 µs -3.889 16.18

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 10.305 10.369 10.569 10.960 11.501 11.849 11.866 0.932 1.480 0.269 10.960 ppm 6.303e+04 2.512e+06
Temp /dev/sda 41.000 41.000 42.000 44.000 47.000 48.000 48.000 5.000 7.000 1.341 43.772 °C
Temp /dev/sdb 51.000 51.000 53.000 54.000 63.000 64.000 65.000 10.000 13.000 2.684 54.996 °C
Temp /dev/sdc 51.000 53.000 53.000 54.000 58.000 60.000 65.000 5.000 7.000 1.696 54.635 °C
Temp /dev/sdd 58.000 58.000 59.000 61.000 71.000 72.000 73.000 12.000 14.000 3.093 62.087 °C
Temp /dev/sde 41.000 41.000 42.000 44.000 48.000 50.000 50.000 6.000 9.000 1.650 43.706 °C
Temp /dev/sdf 52.000 52.000 53.000 55.000 64.000 65.000 66.000 11.000 13.000 2.826 55.838 °C
Temp LM0 25.500 26.000 26.750 29.000 33.500 38.000 40.250 6.750 12.000 2.182 29.144 °C
Temp LM1 38.500 39.000 40.000 41.500 43.500 44.500 46.000 3.500 5.500 1.096 41.409 °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 41.000 41.000 42.000 44.000 47.000 48.000 48.000 5.000 7.000 1.341 43.772 °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 26.500 26.750 27.500 29.750 33.750 35.000 36.250 6.250 8.250 1.712 29.888 °C
Temp LM15 52.000 52.000 53.000 55.000 64.000 65.000 66.000 11.000 13.000 2.878 55.959 °C
Temp LM16 57.500 58.000 59.000 61.000 65.000 66.500 67.000 6.000 8.500 1.594 61.078 °C
Temp LM17 58.000 58.000 59.000 61.000 71.000 73.000 73.000 12.000 15.000 3.124 62.230 °C
Temp LM18 51.000 52.000 53.000 55.000 63.000 64.000 65.000 10.000 12.000 2.702 55.115 °C
Temp LM19 25.000 26.000 27.000 29.000 35.000 63.000 74.000 8.000 37.000 6.186 30.372 °C
Temp LM2 41.000 41.000 42.000 44.000 48.000 50.000 50.000 6.000 9.000 1.652 43.716 °C
Temp LM20 25.000 26.000 27.000 29.000 35.000 62.000 74.000 8.000 36.000 5.343 30.106 °C
Temp LM21 21.000 23.000 24.000 26.000 32.000 58.000 71.000 8.000 35.000 5.673 26.891 °C
Temp LM22 23.000 24.000 25.000 28.000 34.000 61.000 71.000 9.000 37.000 5.822 28.840 °C
Temp LM23 23.000 24.000 25.000 27.000 32.000 58.000 65.000 7.000 34.000 5.438 28.239 °C
Temp LM3 29.000 29.000 30.000 32.000 34.000 37.000 38.000 4.000 8.000 1.519 31.877 °C
Temp LM4 28.000 28.500 29.500 31.500 34.500 35.500 36.000 5.000 7.000 1.470 31.667 °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 25.000 25.500 26.500 28.500 34.500 63.000 71.500 8.000 37.500 6.266 29.896 °C
Temp LM7 57.000 58.000 59.000 61.000 65.000 66.000 67.000 6.000 8.000 1.619 60.909 °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 26.000 26.000 29.000 35.000 64.000 73.000 9.000 38.000 6.315 30.133 °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 57.500 58.000 59.000 61.000 65.000 66.500 67.000 6.000 8.500 1.601 61.080 °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) -1.255 -1.107 -0.846 -0.006 1.004 1.311 1.475 1.850 2.418 0.542 0.042 ms -3.403 7.947

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 -3.505 -1.627 -0.875 0.088 0.919 2.177 2.875 1.795 3.804 0.617 0.040 ms -3.972 17.59

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 -267.163 -81.266 -30.057 37.222 102.288 153.572 354.264 132.345 234.838 43.698 36.451 µs -0.3211 8.937

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 -205.609 -86.603 -33.141 24.423 93.513 147.998 224.014 126.654 234.601 42.658 27.628 µs -0.9892 7.361

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 -231.691 -77.879 -37.190 30.373 95.041 146.451 236.756 132.231 224.330 43.193 30.297 µs -1.025 6.81

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 -342.178 -53.472 -8.294 42.899 84.273 110.607 265.814 92.567 164.079 32.928 40.688 µs -0.7144 17.03

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) -218.117 -81.351 -38.348 -4.355 52.068 91.496 173.596 90.416 172.847 33.767 0.679 µs -3.889 16.18

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 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) 1.953 3.934 5.812 14.749 39.535 75.480 229.518 33.723 71.546 14.116 18.097 µs 5.434 49.62

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 1.644 4.018 6.057 15.499 42.791 116.627 195.341 36.734 112.609 18.455 19.740 µs 5.081 36.53

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 1.817 5.210 7.675 21.161 56.634 85.984 645.360 48.959 80.774 24.787 25.769 µs 14.54 345.9

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 1.339 2.574 4.016 15.497 41.608 66.086 98.400 37.592 63.512 12.951 18.339 µs 2.953 10.88

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 1.099 1.969 3.466 15.876 53.132 72.551 121.716 49.666 70.582 15.885 19.948 µs 2.306 7.723

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 1.521 3.441 5.777 15.841 57.970 83.342 167.971 52.193 79.901 16.970 21.177 µs 3.079 13.17

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) 0.137 0.335 0.555 2.344 13.443 29.256 111.341 12.888 28.921 6.263 4.154 µs 5.466 62.21

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 10.305 10.369 10.569 10.960 11.501 11.849 11.866 0.932 1.480 0.269 10.960 ppm 6.303e+04 2.512e+06
Local Clock Time Offset -218.116 -81.350 -38.347 -4.354 52.067 91.495 173.595 90.414 172.845 33.766 0.679 µs -3.889 16.18
Local RMS Frequency Jitter 0.051 0.109 0.187 1.033 3.430 7.741 12.621 3.243 7.632 1.437 1.477 ppb 2.949 16.86
Local RMS Time Jitter 0.280 0.406 0.492 0.922 3.337 7.016 19.581 2.845 6.610 1.388 1.356 µs 5.403 47.45
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 1.953 3.934 5.812 14.749 39.535 75.480 229.518 33.723 71.546 14.116 18.097 µs 5.434 49.62
Server Jitter 204.17.205.1 1.644 4.018 6.057 15.499 42.791 116.627 195.341 36.734 112.609 18.455 19.740 µs 5.081 36.53
Server Jitter 204.17.205.17 1.817 5.210 7.675 21.161 56.634 85.984 645.360 48.959 80.774 24.787 25.769 µs 14.54 345.9
Server Jitter 204.17.205.23 1.339 2.574 4.016 15.497 41.608 66.086 98.400 37.592 63.512 12.951 18.339 µs 2.953 10.88
Server Jitter 204.17.205.24 1.099 1.969 3.466 15.876 53.132 72.551 121.716 49.666 70.582 15.885 19.948 µs 2.306 7.723
Server Jitter 204.17.205.27 1.521 3.441 5.777 15.841 57.970 83.342 167.971 52.193 79.901 16.970 21.177 µs 3.079 13.17
Server Jitter SHM(0) 0.137 0.335 0.555 2.344 13.443 29.256 111.341 12.888 28.921 6.263 4.154 µs 5.466 62.21
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1.255 -1.107 -0.846 -0.006 1.004 1.311 1.475 1.850 2.418 0.542 0.042 ms -3.403 7.947
Server Offset 204.17.205.1 -3.505 -1.627 -0.875 0.088 0.919 2.177 2.875 1.795 3.804 0.617 0.040 ms -3.972 17.59
Server Offset 204.17.205.17 -267.163 -81.266 -30.057 37.222 102.288 153.572 354.264 132.345 234.838 43.698 36.451 µs -0.3211 8.937
Server Offset 204.17.205.23 -205.609 -86.603 -33.141 24.423 93.513 147.998 224.014 126.654 234.601 42.658 27.628 µs -0.9892 7.361
Server Offset 204.17.205.24 -231.691 -77.879 -37.190 30.373 95.041 146.451 236.756 132.231 224.330 43.193 30.297 µs -1.025 6.81
Server Offset 204.17.205.27 -342.178 -53.472 -8.294 42.899 84.273 110.607 265.814 92.567 164.079 32.928 40.688 µs -0.7144 17.03
Server Offset SHM(0) -218.117 -81.351 -38.348 -4.355 52.068 91.496 173.596 90.416 172.847 33.767 0.679 µs -3.889 16.18
Temp /dev/sda 41.000 41.000 42.000 44.000 47.000 48.000 48.000 5.000 7.000 1.341 43.772 °C
Temp /dev/sdb 51.000 51.000 53.000 54.000 63.000 64.000 65.000 10.000 13.000 2.684 54.996 °C
Temp /dev/sdc 51.000 53.000 53.000 54.000 58.000 60.000 65.000 5.000 7.000 1.696 54.635 °C
Temp /dev/sdd 58.000 58.000 59.000 61.000 71.000 72.000 73.000 12.000 14.000 3.093 62.087 °C
Temp /dev/sde 41.000 41.000 42.000 44.000 48.000 50.000 50.000 6.000 9.000 1.650 43.706 °C
Temp /dev/sdf 52.000 52.000 53.000 55.000 64.000 65.000 66.000 11.000 13.000 2.826 55.838 °C
Temp LM0 25.500 26.000 26.750 29.000 33.500 38.000 40.250 6.750 12.000 2.182 29.144 °C
Temp LM1 38.500 39.000 40.000 41.500 43.500 44.500 46.000 3.500 5.500 1.096 41.409 °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 41.000 41.000 42.000 44.000 47.000 48.000 48.000 5.000 7.000 1.341 43.772 °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 26.500 26.750 27.500 29.750 33.750 35.000 36.250 6.250 8.250 1.712 29.888 °C
Temp LM15 52.000 52.000 53.000 55.000 64.000 65.000 66.000 11.000 13.000 2.878 55.959 °C
Temp LM16 57.500 58.000 59.000 61.000 65.000 66.500 67.000 6.000 8.500 1.594 61.078 °C
Temp LM17 58.000 58.000 59.000 61.000 71.000 73.000 73.000 12.000 15.000 3.124 62.230 °C
Temp LM18 51.000 52.000 53.000 55.000 63.000 64.000 65.000 10.000 12.000 2.702 55.115 °C
Temp LM19 25.000 26.000 27.000 29.000 35.000 63.000 74.000 8.000 37.000 6.186 30.372 °C
Temp LM2 41.000 41.000 42.000 44.000 48.000 50.000 50.000 6.000 9.000 1.652 43.716 °C
Temp LM20 25.000 26.000 27.000 29.000 35.000 62.000 74.000 8.000 36.000 5.343 30.106 °C
Temp LM21 21.000 23.000 24.000 26.000 32.000 58.000 71.000 8.000 35.000 5.673 26.891 °C
Temp LM22 23.000 24.000 25.000 28.000 34.000 61.000 71.000 9.000 37.000 5.822 28.840 °C
Temp LM23 23.000 24.000 25.000 27.000 32.000 58.000 65.000 7.000 34.000 5.438 28.239 °C
Temp LM3 29.000 29.000 30.000 32.000 34.000 37.000 38.000 4.000 8.000 1.519 31.877 °C
Temp LM4 28.000 28.500 29.500 31.500 34.500 35.500 36.000 5.000 7.000 1.470 31.667 °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 25.000 25.500 26.500 28.500 34.500 63.000 71.500 8.000 37.500 6.266 29.896 °C
Temp LM7 57.000 58.000 59.000 61.000 65.000 66.000 67.000 6.000 8.000 1.619 60.909 °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 26.000 26.000 29.000 35.000 64.000 73.000 9.000 38.000 6.315 30.133 °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 57.500 58.000 59.000 61.000 65.000 66.500 67.000 6.000 8.500 1.601 61.080 °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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