NTPsec

Kong

Report generated: Tue Dec 10 14:59:01 2024 UTC
Start Time: Tue Dec 3 14:59:00 2024 UTC
End Time: Tue Dec 10 14:59:00 2024 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 -495.167 -200.218 -50.356 -1.515 48.750 207.063 518.299 99.106 407.281 55.925 -1.029 µs -3.573 33.33
Local Clock Frequency Offset 11.302 11.416 11.444 11.748 13.578 13.868 13.921 2.134 2.452 0.587 11.899 ppm 7230 1.407e+05

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 5.576 10.053 12.297 20.972 49.143 81.084 123.754 36.846 71.031 12.776 24.008 µs 6.197 29.1

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 2.505 4.613 5.991 11.804 68.007 135.632 191.331 62.016 131.019 23.307 18.699 ppb 3.183 15.89

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 -495.167 -200.218 -50.356 -1.515 48.750 207.063 518.299 99.106 407.281 55.925 -1.029 µs -3.573 33.33

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 11.302 11.416 11.444 11.748 13.578 13.868 13.921 2.134 2.452 0.587 11.899 ppm 7230 1.407e+05
Temp /dev/sda 44.000 44.000 44.000 47.000 49.000 49.000 51.000 5.000 5.000 1.377 46.528 °C
Temp /dev/sdb 33.000 33.000 33.000 36.000 37.000 39.000 39.000 4.000 6.000 1.303 35.540 °C
Temp LM0 48.000 49.000 49.000 54.000 58.000 59.000 59.000 9.000 10.000 2.895 53.865 °C
Temp LM1 40.125 40.625 41.250 43.875 73.625 75.375 84.625 32.375 34.750 8.998 46.827 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.091 25.008 °C
Temp LM11 60.000 60.000 61.000 62.000 63.000 64.000 64.000 2.000 4.000 0.867 62.144 °C
Temp LM12 3.000 4.000 5.000 12.000 19.000 22.000 24.000 14.000 18.000 4.194 12.479 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.094 25.009 °C
Temp LM14 41.000 42.000 42.000 44.000 45.000 46.000 46.000 3.000 4.000 0.974 43.645 °C
Temp LM15 34.000 34.000 35.000 37.000 62.000 64.000 73.000 27.000 30.000 7.678 38.958 °C
Temp LM16 65.500 66.000 66.500 67.500 68.500 69.000 69.000 2.000 3.000 0.690 67.482 °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 39.500 40.250 40.750 43.250 72.750 75.000 85.000 32.000 34.750 8.977 46.404 °C
Temp LM20 40.000 40.500 41.250 43.875 73.625 75.375 84.375 32.375 34.875 8.999 46.801 °C
Temp LM21 65.750 66.000 66.500 67.750 68.750 69.125 69.375 2.250 3.125 0.682 67.628 °C
Temp LM22 0.000 33.000 33.000 36.000 37.000 39.000 39.000 4.000 6.000 1.520 35.582 °C
Temp LM23 63.850 64.850 65.850 68.850 69.850 70.850 70.850 4.000 6.000 1.440 68.214 °C
Temp LM3 44.000 44.000 44.000 47.000 49.000 49.000 51.000 5.000 5.000 1.378 46.525 °C
Temp LM4 46.850 47.850 48.850 49.850 51.850 52.850 54.850 3.000 5.000 1.072 50.063 °C
Temp LM5 46.850 47.850 48.850 49.850 51.850 52.850 54.850 3.000 5.000 1.063 50.079 °C
Temp LM6 54.850 55.850 56.850 57.850 61.850 66.850 73.850 5.000 11.000 1.987 58.552 °C
Temp LM7 46.850 47.850 48.850 49.850 51.850 52.850 54.850 3.000 5.000 1.059 50.092 °C
Temp LM8 41.000 42.000 42.000 44.000 45.000 46.000 46.000 3.000 4.000 0.974 43.646 °C
Temp LM9 34.000 34.500 35.000 37.000 50.500 52.000 54.000 15.500 17.500 4.062 37.918 °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 5.000 8.000 9.000 12.000 14.000 15.000 17.000 5.000 7.000 1.595 11.582 nSat 264.3 1777
TDOP 0.680 0.800 0.910 1.320 2.280 3.270 12.740 1.370 2.470 0.484 1.417 15.75 77.44

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) -587.855 -200.190 -66.428 5.536 87.761 219.631 637.352 154.189 419.821 67.508 6.938 µs -2.702 26.92

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) -1,507.143 -818.054 -585.441 22.785 326.511 656.315 1,020.577 911.952 1,474.369 281.086 -21.962 µs -5.271 17.29

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 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net)

peer offset 2001:67c:1270:0:dea6:32ff:feaf:803b plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -2.448 -2.174 -0.897 -0.578 -0.251 -0.113 0.763 0.646 2.061 0.295 -0.597 ms -39.62 191.7

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 -1.441 -1.120 -0.810 0.012 0.508 0.717 1.143 1.317 1.836 0.376 -0.029 ms -5.241 15.77

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 204.17.205.16

peer offset 204.17.205.16 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.16 -632.212 -185.278 -64.535 7.738 75.808 197.981 526.905 140.343 383.259 60.781 7.347 µs -3.619 28.23

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 -441.991 -228.663 -90.972 -10.472 51.930 219.416 512.476 142.902 448.079 64.020 -12.270 µs -4.602 28.07

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) -8.670 1.187 2.180 2.664 3.186 3.424 11.731 1.006 2.236 0.490 2.660 ms 96.88 653

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) -1.857 -1.555 -0.586 -0.196 0.232 0.447 0.679 0.818 2.002 0.303 -0.202 ms -11.12 43.83

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) -0.138 0.082 0.258 0.563 0.931 1.069 1.223 0.673 0.986 0.210 0.580 ms 10.79 31.57

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) -1.101 -0.897 0.180 0.529 0.998 1.194 1.379 0.818 2.091 0.335 0.530 ms 0.1872 7.973

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) -189.229 -147.089 -143.341 -130.988 -126.249 -124.453 -120.786 17.093 22.636 5.231 -132.428 ms -1.83e+04 4.838e+05

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) 1.341 3.919 5.544 17.891 70.218 109.285 4,267.582 64.674 105.366 97.735 28.124 µs 33.13 1277

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) 1.343 2.826 4.086 13.680 56.183 111.113 244.104 52.097 108.287 20.399 20.130 µs 3.262 20.11

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 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net)

peer jitter 2001:67c:1270:0:dea6:32ff:feaf:803b plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.108 0.186 0.286 0.584 5.504 9.142 205.076 5.218 8.956 8.259 1.539 ms 20.39 503.2

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 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 1.583 3.714 5.908 17.065 53.992 102.146 236.924 48.084 98.432 19.765 22.573 µs 4.149 28.61

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 204.17.205.16

peer jitter 204.17.205.16 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.16 0.002 0.004 0.006 0.019 0.067 0.129 5.834 0.060 0.125 0.124 0.029 ms 40.26 1819

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 1.115 2.519 4.501 17.173 77.556 245.195 2,271.799 73.055 242.676 82.411 31.567 µs 12.37 276.9

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 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) 0.093 0.216 0.275 0.634 4.886 11.284 27.679 4.611 11.068 2.172 1.413 ms 4.264 39.17

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 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) 0.086 0.172 0.258 0.509 1.761 3.119 20.118 1.503 2.947 0.946 0.713 ms 9.497 144.6

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) 0.125 0.191 0.257 0.461 1.307 2.984 7.176 1.050 2.793 0.650 0.587 ms 7.494 72.44

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 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) 0.114 0.170 0.252 0.464 1.323 3.980 11.279 1.070 3.810 0.753 0.634 ms 6.257 60.4

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) 0.116 0.309 0.461 2.189 10.590 13.242 50.313 10.129 12.933 3.629 3.933 ms 1.569 7.945

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 11.302 11.416 11.444 11.748 13.578 13.868 13.921 2.134 2.452 0.587 11.899 ppm 7230 1.407e+05
Local Clock Time Offset -495.167 -200.218 -50.356 -1.515 48.750 207.063 518.299 99.106 407.281 55.925 -1.029 µs -3.573 33.33
Local RMS Frequency Jitter 2.505 4.613 5.991 11.804 68.007 135.632 191.331 62.016 131.019 23.307 18.699 ppb 3.183 15.89
Local RMS Time Jitter 5.576 10.053 12.297 20.972 49.143 81.084 123.754 36.846 71.031 12.776 24.008 µs 6.197 29.1
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 1.341 3.919 5.544 17.891 70.218 109.285 4,267.582 64.674 105.366 97.735 28.124 µs 33.13 1277
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 1.343 2.826 4.086 13.680 56.183 111.113 244.104 52.097 108.287 20.399 20.130 µs 3.262 20.11
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.108 0.186 0.286 0.584 5.504 9.142 205.076 5.218 8.956 8.259 1.539 ms 20.39 503.2
Server Jitter 204.17.205.1 1.583 3.714 5.908 17.065 53.992 102.146 236.924 48.084 98.432 19.765 22.573 µs 4.149 28.61
Server Jitter 204.17.205.16 0.002 0.004 0.006 0.019 0.067 0.129 5.834 0.060 0.125 0.124 0.029 ms 40.26 1819
Server Jitter 204.17.205.30 1.115 2.519 4.501 17.173 77.556 245.195 2,271.799 73.055 242.676 82.411 31.567 µs 12.37 276.9
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.093 0.216 0.275 0.634 4.886 11.284 27.679 4.611 11.068 2.172 1.413 ms 4.264 39.17
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.086 0.172 0.258 0.509 1.761 3.119 20.118 1.503 2.947 0.946 0.713 ms 9.497 144.6
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.125 0.191 0.257 0.461 1.307 2.984 7.176 1.050 2.793 0.650 0.587 ms 7.494 72.44
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.114 0.170 0.252 0.464 1.323 3.980 11.279 1.070 3.810 0.753 0.634 ms 6.257 60.4
Server Jitter SHM(0) 0.116 0.309 0.461 2.189 10.590 13.242 50.313 10.129 12.933 3.629 3.933 ms 1.569 7.945
Server Offset 2001:470:e815::24 (pi4.rellim.com) -587.855 -200.190 -66.428 5.536 87.761 219.631 637.352 154.189 419.821 67.508 6.938 µs -2.702 26.92
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1,507.143 -818.054 -585.441 22.785 326.511 656.315 1,020.577 911.952 1,474.369 281.086 -21.962 µs -5.271 17.29
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -2.448 -2.174 -0.897 -0.578 -0.251 -0.113 0.763 0.646 2.061 0.295 -0.597 ms -39.62 191.7
Server Offset 204.17.205.1 -1.441 -1.120 -0.810 0.012 0.508 0.717 1.143 1.317 1.836 0.376 -0.029 ms -5.241 15.77
Server Offset 204.17.205.16 -632.212 -185.278 -64.535 7.738 75.808 197.981 526.905 140.343 383.259 60.781 7.347 µs -3.619 28.23
Server Offset 204.17.205.30 -441.991 -228.663 -90.972 -10.472 51.930 219.416 512.476 142.902 448.079 64.020 -12.270 µs -4.602 28.07
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -8.670 1.187 2.180 2.664 3.186 3.424 11.731 1.006 2.236 0.490 2.660 ms 96.88 653
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -1.857 -1.555 -0.586 -0.196 0.232 0.447 0.679 0.818 2.002 0.303 -0.202 ms -11.12 43.83
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -0.138 0.082 0.258 0.563 0.931 1.069 1.223 0.673 0.986 0.210 0.580 ms 10.79 31.57
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -1.101 -0.897 0.180 0.529 0.998 1.194 1.379 0.818 2.091 0.335 0.530 ms 0.1872 7.973
Server Offset SHM(0) -189.229 -147.089 -143.341 -130.988 -126.249 -124.453 -120.786 17.093 22.636 5.231 -132.428 ms -1.83e+04 4.838e+05
TDOP 0.680 0.800 0.910 1.320 2.280 3.270 12.740 1.370 2.470 0.484 1.417 15.75 77.44
Temp /dev/sda 44.000 44.000 44.000 47.000 49.000 49.000 51.000 5.000 5.000 1.377 46.528 °C
Temp /dev/sdb 33.000 33.000 33.000 36.000 37.000 39.000 39.000 4.000 6.000 1.303 35.540 °C
Temp LM0 48.000 49.000 49.000 54.000 58.000 59.000 59.000 9.000 10.000 2.895 53.865 °C
Temp LM1 40.125 40.625 41.250 43.875 73.625 75.375 84.625 32.375 34.750 8.998 46.827 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.091 25.008 °C
Temp LM11 60.000 60.000 61.000 62.000 63.000 64.000 64.000 2.000 4.000 0.867 62.144 °C
Temp LM12 3.000 4.000 5.000 12.000 19.000 22.000 24.000 14.000 18.000 4.194 12.479 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.094 25.009 °C
Temp LM14 41.000 42.000 42.000 44.000 45.000 46.000 46.000 3.000 4.000 0.974 43.645 °C
Temp LM15 34.000 34.000 35.000 37.000 62.000 64.000 73.000 27.000 30.000 7.678 38.958 °C
Temp LM16 65.500 66.000 66.500 67.500 68.500 69.000 69.000 2.000 3.000 0.690 67.482 °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 39.500 40.250 40.750 43.250 72.750 75.000 85.000 32.000 34.750 8.977 46.404 °C
Temp LM20 40.000 40.500 41.250 43.875 73.625 75.375 84.375 32.375 34.875 8.999 46.801 °C
Temp LM21 65.750 66.000 66.500 67.750 68.750 69.125 69.375 2.250 3.125 0.682 67.628 °C
Temp LM22 0.000 33.000 33.000 36.000 37.000 39.000 39.000 4.000 6.000 1.520 35.582 °C
Temp LM23 63.850 64.850 65.850 68.850 69.850 70.850 70.850 4.000 6.000 1.440 68.214 °C
Temp LM3 44.000 44.000 44.000 47.000 49.000 49.000 51.000 5.000 5.000 1.378 46.525 °C
Temp LM4 46.850 47.850 48.850 49.850 51.850 52.850 54.850 3.000 5.000 1.072 50.063 °C
Temp LM5 46.850 47.850 48.850 49.850 51.850 52.850 54.850 3.000 5.000 1.063 50.079 °C
Temp LM6 54.850 55.850 56.850 57.850 61.850 66.850 73.850 5.000 11.000 1.987 58.552 °C
Temp LM7 46.850 47.850 48.850 49.850 51.850 52.850 54.850 3.000 5.000 1.059 50.092 °C
Temp LM8 41.000 42.000 42.000 44.000 45.000 46.000 46.000 3.000 4.000 0.974 43.646 °C
Temp LM9 34.000 34.500 35.000 37.000 50.500 52.000 54.000 15.500 17.500 4.062 37.918 °C
nSats 5.000 8.000 9.000 12.000 14.000 15.000 17.000 5.000 7.000 1.595 11.582 nSat 264.3 1777
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.
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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