NTPsec

Kong

Report generated: Sat May 31 13:59:01 2025 UTC
Start Time: Sat May 24 13:59:00 2025 UTC
End Time: Sat May 31 13:59:00 2025 UTC
Report Period: 7.0 days

Daily stats   Weekly stats   Live GNSS Data   24 Hour Scatter Plots: ( )

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 -1,814.578 -124.609 -68.500 1.312 67.507 141.475 1,510.427 136.007 266.084 79.885 0.089 µs -4.391 196.4
Local Clock Frequency Offset 10.281 11.760 11.818 12.077 13.197 13.622 14.099 1.379 1.863 0.388 12.197 ppm 2.072 8.422

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 10.762 14.408 18.157 36.529 69.980 111.609 1,011.943 51.823 97.201 49.406 42.648 µs 12.37 186.3

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 5.066 6.734 8.835 18.734 54.332 128.616 658.358 45.497 121.882 35.633 25.522 ppb 10.61 149.6

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 -1,814.578 -124.609 -68.500 1.312 67.507 141.475 1,510.427 136.007 266.084 79.885 0.089 µs -4.391 196.4

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 10.281 11.760 11.818 12.077 13.197 13.622 14.099 1.379 1.863 0.388 12.197 ppm 2.072 8.422
Temp /dev/nvme0n1 64.000 67.000 68.000 71.000 72.000 73.000 74.000 4.000 6.000 1.209 70.749 °C
Temp /dev/nvme1n1 49.000 50.000 51.000 51.000 53.000 55.000 59.000 2.000 5.000 0.937 51.472 °C
Temp /dev/sda 46.000 46.000 47.000 49.000 51.000 53.000 54.000 4.000 7.000 1.205 49.178 °C
Temp /dev/sdb 35.000 35.000 36.000 37.000 40.000 43.000 44.000 4.000 8.000 1.330 37.305 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 58.000 59.000 8.000 9.000 2.697 54.258 °C
Temp LM1 38.000 38.625 39.125 40.500 65.250 68.625 84.375 26.125 30.000 6.706 42.448 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.032 25.001 °C
Temp LM11 61.000 62.000 62.000 63.000 64.000 64.000 65.000 2.000 2.000 0.630 62.897 °C
Temp LM12 3.000 5.000 7.000 24.000 30.000 33.000 38.000 23.000 28.000 5.250 22.866 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 25.000 0.000 0.000 0.000 25.000 °C
Temp LM14 44.000 44.000 44.000 45.000 47.000 47.000 47.000 3.000 3.000 0.695 45.491 °C
Temp LM15 33.000 34.000 35.000 36.000 54.000 57.000 73.000 19.000 23.000 4.977 37.157 °C
Temp LM16 66.500 67.000 67.500 68.000 69.000 69.000 69.500 1.500 2.000 0.513 68.054 °C
Temp LM17 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM18 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM19 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM2 38.000 38.750 39.250 41.000 62.750 68.500 83.750 23.500 29.750 6.306 42.797 °C
Temp LM20 38.000 38.625 39.125 40.500 65.250 68.500 84.375 26.125 29.875 6.697 42.443 °C
Temp LM21 66.750 67.000 67.500 68.125 69.000 69.125 69.750 1.500 2.125 0.492 68.197 °C
Temp LM22 35.000 35.000 36.000 37.000 40.000 43.000 43.000 4.000 8.000 1.317 37.339 °C
Temp LM23 63.850 66.850 67.850 70.850 71.850 72.850 73.850 4.000 6.000 1.226 70.616 °C
Temp LM3 46.000 46.000 47.000 49.000 51.000 53.000 54.000 4.000 7.000 1.202 49.179 °C
Temp LM4 48.850 49.850 50.850 50.850 52.850 54.850 58.850 2.000 5.000 0.935 51.306 °C
Temp LM5 48.850 49.850 50.850 50.850 52.850 54.850 58.850 2.000 5.000 0.934 51.308 °C
Temp LM6 55.850 57.850 58.850 59.850 62.850 70.850 78.850 4.000 13.000 2.044 60.209 °C
Temp LM7 48.850 49.850 50.850 50.850 52.850 54.850 58.850 2.000 5.000 0.933 51.315 °C
Temp LM8 44.000 44.000 44.000 45.000 47.000 47.000 47.000 3.000 3.000 0.698 45.492 °C
Temp LM9 34.000 34.500 35.000 36.000 43.500 46.500 54.500 8.500 12.000 2.438 36.722 °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.



Local GPS

local gps plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
nSats 4.000 7.000 8.000 11.000 14.000 15.000 17.000 6.000 8.000 1.633 11.021 nSat -0.08382 2.961
TDOP 0.650 0.800 0.900 1.290 2.240 3.370 27.060 1.340 2.570 0.523 1.414 5.337 132.7

Local GPS. The Time Dilution of Precision (TDOP) is plotted in blue. The number of visible satellites (nSat) is plotted in red.

TDOP is field 3, and nSats is field 4, from the gpsd log file. The gpsd log file is created by the ntploggps program.

TDOP is a dimensionless error factor. Smaller numbers are better. TDOP ranges from 1 (ideal), 2 to 5 (good), to greater than 20 (poor). Some GNSS receivers report TDOP less than one which is theoretically impossible.



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::24 (pi4.rellim.com)

peer offset 2001:470:e815::24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2001:470:e815::24 (pi4.rellim.com) -2.025 -0.164 -0.093 0.005 0.078 0.166 17.042 0.171 0.330 0.274 0.004 ms 57.13 3568

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 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) -2,868.472 -657.263 -246.550 1.844 194.919 293.149 1,158.262 441.469 950.412 204.268 -19.837 µs -6.543 82.17

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 -3.037 -1.414 -0.424 -0.023 0.274 0.663 1.331 0.698 2.077 0.334 -0.052 ms -3.39 28.2

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 204.17.205.30

peer offset 204.17.205.30 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.30 -1,322.262 -154.791 -93.045 -5.657 75.364 126.507 777.237 168.409 281.298 76.571 -9.064 µs -5.893 105.4

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 2405:fc00::1 (robusta.dcs1.biz)

peer offset 2405:fc00::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2405:fc00::1 (robusta.dcs1.biz) 0.996 3.415 3.772 4.393 5.331 5.710 9.168 1.559 2.295 0.513 4.446 ms 0.5104 10.31

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 2604:a880:1:20::17:5001 (ntp1.glypnod.com)

peer offset 2604:a880:1:20::17:5001 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -29.161 -24.822 -16.782 1.145 1.913 2.270 4.223 18.696 27.092 5.909 -1.147 ms -2.653 9.41

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 2606:4700:f1::1 (time.cloudflare.com)

peer offset 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.145 1.555 1.863 2.302 2.707 2.977 4.351 0.844 1.422 0.324 2.287 ms -2.682 30.89

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 2606:4700:f1::123 (time.cloudflare.com)

peer offset 2606:4700:f1::123 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2606:4700:f1::123 (time.cloudflare.com) 1.289 1.918 2.072 2.341 2.698 2.871 3.138 0.627 0.953 0.192 2.355 ms 0.1682 5.034

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) -186.588 -148.033 -143.652 -129.881 -124.298 -121.807 -117.015 19.354 26.226 5.655 -131.114 ms -1.245 4.856

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::24 (pi4.rellim.com)

peer jitter 2001:470:e815::24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 0.007 0.017 0.093 0.163 0.193 13.590 0.146 0.186 0.215 0.095 ms 58.87 3687

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 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) 1.974 4.816 12.754 55.338 168.972 205.221 1,140.034 156.218 200.405 56.726 77.967 µs 2.516 34.44

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 3.498 7.799 20.601 111.914 195.355 230.046 1,189.529 174.754 222.247 61.961 103.619 µs 1.928 27.87

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 204.17.205.30

peer jitter 204.17.205.30 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.30 5.324 11.102 26.614 100.771 185.768 241.801 2,826.345 159.154 230.699 105.572 106.261 µs 16.2 372.3

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 2405:fc00::1 (robusta.dcs1.biz)

peer jitter 2405:fc00::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.118 0.189 0.314 1.321 4.237 9.540 33.796 3.923 9.351 1.804 1.731 ms 5.785 69.61

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 2604:a880:1:20::17:5001 (ntp1.glypnod.com)

peer jitter 2604:a880:1:20::17:5001 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.128 0.220 0.344 1.442 9.558 14.286 199.917 9.214 14.067 8.825 3.175 ms 17.92 382.7

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 2606:4700:f1::1 (time.cloudflare.com)

peer jitter 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.134 0.171 0.242 0.549 1.914 13.926 205.061 1.672 13.755 11.330 1.501 ms 17.2 306.2

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 2606:4700:f1::123 (time.cloudflare.com)

peer jitter 2606:4700:f1::123 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.111 0.159 0.216 0.531 2.242 4.198 28.923 2.026 4.040 1.184 0.781 ms 15.77 359.4

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) 0.094 0.289 0.422 1.395 10.047 12.634 46.211 9.626 12.345 3.371 3.225 ms 1.418 5.625

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 10.281 11.760 11.818 12.077 13.197 13.622 14.099 1.379 1.863 0.388 12.197 ppm 2.072 8.422
Local Clock Time Offset -1,814.578 -124.609 -68.500 1.312 67.507 141.475 1,510.427 136.007 266.084 79.885 0.089 µs -4.391 196.4
Local RMS Frequency Jitter 5.066 6.734 8.835 18.734 54.332 128.616 658.358 45.497 121.882 35.633 25.522 ppb 10.61 149.6
Local RMS Time Jitter 10.762 14.408 18.157 36.529 69.980 111.609 1,011.943 51.823 97.201 49.406 42.648 µs 12.37 186.3
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 0.007 0.017 0.093 0.163 0.193 13.590 0.146 0.186 0.215 0.095 ms 58.87 3687
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 1.974 4.816 12.754 55.338 168.972 205.221 1,140.034 156.218 200.405 56.726 77.967 µs 2.516 34.44
Server Jitter 204.17.205.1 3.498 7.799 20.601 111.914 195.355 230.046 1,189.529 174.754 222.247 61.961 103.619 µs 1.928 27.87
Server Jitter 204.17.205.30 5.324 11.102 26.614 100.771 185.768 241.801 2,826.345 159.154 230.699 105.572 106.261 µs 16.2 372.3
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.118 0.189 0.314 1.321 4.237 9.540 33.796 3.923 9.351 1.804 1.731 ms 5.785 69.61
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.128 0.220 0.344 1.442 9.558 14.286 199.917 9.214 14.067 8.825 3.175 ms 17.92 382.7
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.134 0.171 0.242 0.549 1.914 13.926 205.061 1.672 13.755 11.330 1.501 ms 17.2 306.2
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.111 0.159 0.216 0.531 2.242 4.198 28.923 2.026 4.040 1.184 0.781 ms 15.77 359.4
Server Jitter SHM(0) 0.094 0.289 0.422 1.395 10.047 12.634 46.211 9.626 12.345 3.371 3.225 ms 1.418 5.625
Server Offset 2001:470:e815::24 (pi4.rellim.com) -2.025 -0.164 -0.093 0.005 0.078 0.166 17.042 0.171 0.330 0.274 0.004 ms 57.13 3568
Server Offset 2001:470:e815::8 (spidey.rellim.com) -2,868.472 -657.263 -246.550 1.844 194.919 293.149 1,158.262 441.469 950.412 204.268 -19.837 µs -6.543 82.17
Server Offset 204.17.205.1 -3.037 -1.414 -0.424 -0.023 0.274 0.663 1.331 0.698 2.077 0.334 -0.052 ms -3.39 28.2
Server Offset 204.17.205.30 -1,322.262 -154.791 -93.045 -5.657 75.364 126.507 777.237 168.409 281.298 76.571 -9.064 µs -5.893 105.4
Server Offset 2405:fc00::1 (robusta.dcs1.biz) 0.996 3.415 3.772 4.393 5.331 5.710 9.168 1.559 2.295 0.513 4.446 ms 0.5104 10.31
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -29.161 -24.822 -16.782 1.145 1.913 2.270 4.223 18.696 27.092 5.909 -1.147 ms -2.653 9.41
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.145 1.555 1.863 2.302 2.707 2.977 4.351 0.844 1.422 0.324 2.287 ms -2.682 30.89
Server Offset 2606:4700:f1::123 (time.cloudflare.com) 1.289 1.918 2.072 2.341 2.698 2.871 3.138 0.627 0.953 0.192 2.355 ms 0.1682 5.034
Server Offset SHM(0) -186.588 -148.033 -143.652 -129.881 -124.298 -121.807 -117.015 19.354 26.226 5.655 -131.114 ms -1.245 4.856
TDOP 0.650 0.800 0.900 1.290 2.240 3.370 27.060 1.340 2.570 0.523 1.414 5.337 132.7
Temp /dev/nvme0n1 64.000 67.000 68.000 71.000 72.000 73.000 74.000 4.000 6.000 1.209 70.749 °C
Temp /dev/nvme1n1 49.000 50.000 51.000 51.000 53.000 55.000 59.000 2.000 5.000 0.937 51.472 °C
Temp /dev/sda 46.000 46.000 47.000 49.000 51.000 53.000 54.000 4.000 7.000 1.205 49.178 °C
Temp /dev/sdb 35.000 35.000 36.000 37.000 40.000 43.000 44.000 4.000 8.000 1.330 37.305 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 58.000 59.000 8.000 9.000 2.697 54.258 °C
Temp LM1 38.000 38.625 39.125 40.500 65.250 68.625 84.375 26.125 30.000 6.706 42.448 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.032 25.001 °C
Temp LM11 61.000 62.000 62.000 63.000 64.000 64.000 65.000 2.000 2.000 0.630 62.897 °C
Temp LM12 3.000 5.000 7.000 24.000 30.000 33.000 38.000 23.000 28.000 5.250 22.866 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 25.000 0.000 0.000 0.000 25.000 °C
Temp LM14 44.000 44.000 44.000 45.000 47.000 47.000 47.000 3.000 3.000 0.695 45.491 °C
Temp LM15 33.000 34.000 35.000 36.000 54.000 57.000 73.000 19.000 23.000 4.977 37.157 °C
Temp LM16 66.500 67.000 67.500 68.000 69.000 69.000 69.500 1.500 2.000 0.513 68.054 °C
Temp LM17 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM18 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM19 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 °C
Temp LM2 38.000 38.750 39.250 41.000 62.750 68.500 83.750 23.500 29.750 6.306 42.797 °C
Temp LM20 38.000 38.625 39.125 40.500 65.250 68.500 84.375 26.125 29.875 6.697 42.443 °C
Temp LM21 66.750 67.000 67.500 68.125 69.000 69.125 69.750 1.500 2.125 0.492 68.197 °C
Temp LM22 35.000 35.000 36.000 37.000 40.000 43.000 43.000 4.000 8.000 1.317 37.339 °C
Temp LM23 63.850 66.850 67.850 70.850 71.850 72.850 73.850 4.000 6.000 1.226 70.616 °C
Temp LM3 46.000 46.000 47.000 49.000 51.000 53.000 54.000 4.000 7.000 1.202 49.179 °C
Temp LM4 48.850 49.850 50.850 50.850 52.850 54.850 58.850 2.000 5.000 0.935 51.306 °C
Temp LM5 48.850 49.850 50.850 50.850 52.850 54.850 58.850 2.000 5.000 0.934 51.308 °C
Temp LM6 55.850 57.850 58.850 59.850 62.850 70.850 78.850 4.000 13.000 2.044 60.209 °C
Temp LM7 48.850 49.850 50.850 50.850 52.850 54.850 58.850 2.000 5.000 0.933 51.315 °C
Temp LM8 44.000 44.000 44.000 45.000 47.000 47.000 47.000 3.000 3.000 0.698 45.492 °C
Temp LM9 34.000 34.500 35.000 36.000 43.500 46.500 54.500 8.500 12.000 2.438 36.722 °C
nSats 4.000 7.000 8.000 11.000 14.000 15.000 17.000 6.000 8.000 1.633 11.021 nSat -0.08382 2.961
Summary as CSV file


This server:

Motherboard:
OS: Gentoo unstable
GPS:
GPS/PPS server: gpsd
NTP server: NTPsec
../ntp.conf

Notes:

Feb 21 03:28:57 UTC 2019: New install

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.
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 FIsher-Pearson moment of skewness. There are other different ways to calculate Skewness Wikipedia describes Skewness best: "The qualitative interpretation of the skew is complicated and unintuitive."
A normal distribution has a skewness of zero.
Kurtosis, Kurt:
The kurtosis of a random variable X is the fourth standardized moment and is a dimension-less ratio. ntpviz uses standard Kurtosis. There are other different ways to calculate 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".
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.



This page autogenerated by ntpviz, part of the NTPsec project
html 5    Valid CSS!