NTPsec

Kong

Report generated: Sat Apr 26 09:49:00 2025 UTC
Start Time: Fri Apr 25 09:49:00 2025 UTC
End Time: Sat Apr 26 09:49:00 2025 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 -561.917 -403.157 -150.067 2.243 164.216 329.478 461.653 314.283 732.635 105.329 3.712 µs -0.4461 8.926
Local Clock Frequency Offset 11.469 11.485 11.521 12.849 13.793 13.829 13.850 2.273 2.344 0.905 12.595 ppm -0.002028 1.264

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 15.540 17.515 22.186 38.452 86.522 122.070 157.359 64.336 104.555 21.203 44.644 µs 1.767 7.461

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 8.297 9.429 10.819 40.334 130.558 184.976 204.706 119.739 175.547 39.115 49.300 ppb 1.519 5.387

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 -561.917 -403.157 -150.067 2.243 164.216 329.478 461.653 314.283 732.635 105.329 3.712 µs -0.4461 8.926

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 11.469 11.485 11.521 12.849 13.793 13.829 13.850 2.273 2.344 0.905 12.595 ppm -0.002028 1.264
Temp /dev/nvme0n1 63.000 65.000 67.000 70.000 71.000 73.000 73.000 4.000 8.000 1.387 70.076 °C
Temp /dev/nvme1n1 50.000 50.000 51.000 51.000 54.000 56.000 57.000 3.000 6.000 1.186 51.757 °C
Temp /dev/sda 45.000 45.000 46.000 48.000 49.000 49.000 49.000 3.000 4.000 1.139 47.538 °C
Temp /dev/sdb 34.000 34.000 34.000 36.000 37.000 38.000 38.000 3.000 4.000 0.943 35.580 °C
Temp LM0 49.000 49.000 50.000 54.000 58.000 59.000 59.000 8.000 10.000 2.746 54.208 °C
Temp LM1 37.875 38.000 38.500 55.000 76.875 78.375 78.625 38.375 40.375 15.744 55.800 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 26.000 26.000 0.000 1.000 0.208 25.045 °C
Temp LM11 62.000 62.000 62.000 63.000 64.000 64.000 64.000 2.000 2.000 0.595 63.118 °C
Temp LM12 4.000 5.000 8.000 16.000 28.000 32.000 35.000 20.000 27.000 7.188 16.642 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 26.000 26.000 0.000 1.000 0.117 25.014 °C
Temp LM14 44.000 44.000 44.000 45.000 46.000 46.000 47.000 2.000 2.000 0.628 45.108 °C
Temp LM15 33.000 34.000 34.000 44.000 65.000 67.000 67.000 31.000 33.000 12.739 47.299 °C
Temp LM16 67.500 67.500 67.500 68.500 69.500 69.500 69.500 2.000 2.000 0.504 68.444 °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 37.750 38.000 38.500 51.750 76.250 79.000 80.250 37.750 41.000 15.115 54.911 °C
Temp LM20 37.875 38.000 38.500 55.000 76.875 78.375 78.625 38.375 40.375 15.722 55.778 °C
Temp LM21 67.500 67.750 67.750 68.500 69.500 69.750 69.750 1.750 2.000 0.488 68.566 °C
Temp LM22 34.000 34.000 34.000 36.000 37.000 38.000 38.000 3.000 4.000 0.938 35.674 °C
Temp LM23 62.850 64.850 66.850 69.850 70.850 71.850 72.850 4.000 7.000 1.386 69.965 °C
Temp LM3 45.000 45.000 46.000 48.000 49.000 49.000 49.000 3.000 4.000 1.079 47.545 °C
Temp LM4 49.850 49.850 50.850 50.850 53.850 56.850 56.850 3.000 7.000 1.209 51.607 °C
Temp LM5 49.850 49.850 50.850 50.850 53.850 56.850 56.850 3.000 7.000 1.217 51.624 °C
Temp LM6 57.850 57.850 58.850 59.850 66.850 72.850 74.850 8.000 15.000 2.806 61.343 °C
Temp LM7 49.850 49.850 50.850 50.850 53.850 56.850 56.850 3.000 7.000 1.203 51.610 °C
Temp LM8 44.000 44.000 44.000 45.000 46.000 46.000 47.000 2.000 2.000 0.634 45.108 °C
Temp LM9 33.500 34.000 34.500 40.500 51.500 52.000 52.500 17.000 18.000 6.693 41.644 °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 6.000 7.000 10.000 12.000 13.000 14.000 5.000 7.000 1.522 9.676 nSat 0.05632 2.775
TDOP 0.750 0.860 0.940 1.510 3.400 4.520 27.470 2.460 3.660 0.825 1.705 4.65 78.56

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) -567.328 -456.966 -167.294 13.276 184.753 387.046 650.087 352.047 844.012 120.981 11.772 µs -0.07116 8.887

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) -946.241 -607.503 -448.819 -46.186 199.561 362.419 669.132 648.380 969.922 197.077 -61.710 µs -0.6179 5.108

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 -614.784 -455.854 -388.899 -7.540 191.243 317.037 441.697 580.142 772.891 173.763 -27.358 µs -0.6668 3.443

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 -586.772 -290.193 -130.696 28.084 177.520 259.802 428.269 308.216 549.995 103.203 20.032 µs -0.8904 8.153

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 -579.156 -425.403 -200.783 -12.972 134.920 407.092 494.551 335.703 832.495 117.267 -13.913 µs -0.377 9.262

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) -4.097 -3.846 0.883 5.075 6.058 6.412 6.506 5.175 10.258 1.860 4.655 ms -2.963 11.99

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) -9.858 -9.675 -5.536 -0.542 0.103 0.434 0.451 5.639 10.108 2.024 -1.185 ms -2.821 10.52

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) -8.339 -8.333 -3.614 0.530 1.017 1.322 1.404 4.631 9.655 1.965 -0.179 ms -2.539 9.048

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) 0.110 0.187 0.319 0.531 0.840 1.000 1.053 0.521 0.813 0.164 0.544 ms 0.4047 3.693

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) -184.199 -147.365 -135.729 -126.985 -122.512 -121.008 -118.891 13.216 26.357 4.478 -127.574 ms -2.853 18.56

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) 3.932 5.404 9.823 64.082 165.408 226.880 2,520.752 155.585 221.476 142.066 82.210 µs 11.7 173.4

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 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) 3.024 4.195 6.193 32.049 147.932 186.426 214.025 141.739 182.231 42.913 46.808 µs 1.718 5.402

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 3.188 5.356 8.465 54.187 201.824 245.998 286.620 193.359 240.642 63.066 78.092 µs 0.8516 2.83

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 4.756 9.846 15.179 62.717 160.368 259.426 3,249.881 145.189 249.580 147.747 78.813 µs 17.19 349.8

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 6.818 9.988 20.144 82.098 216.497 297.463 335.864 196.353 287.475 63.256 94.334 µs 1.114 4.326

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) 0.220 0.243 0.386 1.226 3.578 9.066 17.235 3.192 8.824 1.703 1.624 ms 5.914 51.58

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) 0.190 0.204 0.298 0.911 5.223 34.926 35.140 4.925 34.721 4.243 1.852 ms 6.733 51.63

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) 0.150 0.207 0.264 0.563 4.387 7.145 7.501 4.123 6.938 1.381 1.083 ms 2.586 9.326

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) 0.149 0.180 0.277 0.583 4.351 13.932 14.036 4.074 13.752 1.949 1.087 ms 5.574 36.12

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) 0.106 0.250 0.369 0.960 6.797 11.210 52.003 6.428 10.960 2.365 1.645 ms 5.459 61.46

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 11.469 11.485 11.521 12.849 13.793 13.829 13.850 2.273 2.344 0.905 12.595 ppm -0.002028 1.264
Local Clock Time Offset -561.917 -403.157 -150.067 2.243 164.216 329.478 461.653 314.283 732.635 105.329 3.712 µs -0.4461 8.926
Local RMS Frequency Jitter 8.297 9.429 10.819 40.334 130.558 184.976 204.706 119.739 175.547 39.115 49.300 ppb 1.519 5.387
Local RMS Time Jitter 15.540 17.515 22.186 38.452 86.522 122.070 157.359 64.336 104.555 21.203 44.644 µs 1.767 7.461
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 3.932 5.404 9.823 64.082 165.408 226.880 2,520.752 155.585 221.476 142.066 82.210 µs 11.7 173.4
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 3.024 4.195 6.193 32.049 147.932 186.426 214.025 141.739 182.231 42.913 46.808 µs 1.718 5.402
Server Jitter 204.17.205.1 3.188 5.356 8.465 54.187 201.824 245.998 286.620 193.359 240.642 63.066 78.092 µs 0.8516 2.83
Server Jitter 204.17.205.17 4.756 9.846 15.179 62.717 160.368 259.426 3,249.881 145.189 249.580 147.747 78.813 µs 17.19 349.8
Server Jitter 204.17.205.30 6.818 9.988 20.144 82.098 216.497 297.463 335.864 196.353 287.475 63.256 94.334 µs 1.114 4.326
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.220 0.243 0.386 1.226 3.578 9.066 17.235 3.192 8.824 1.703 1.624 ms 5.914 51.58
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.190 0.204 0.298 0.911 5.223 34.926 35.140 4.925 34.721 4.243 1.852 ms 6.733 51.63
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.150 0.207 0.264 0.563 4.387 7.145 7.501 4.123 6.938 1.381 1.083 ms 2.586 9.326
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.149 0.180 0.277 0.583 4.351 13.932 14.036 4.074 13.752 1.949 1.087 ms 5.574 36.12
Server Jitter SHM(0) 0.106 0.250 0.369 0.960 6.797 11.210 52.003 6.428 10.960 2.365 1.645 ms 5.459 61.46
Server Offset 2001:470:e815::24 (pi4.rellim.com) -567.328 -456.966 -167.294 13.276 184.753 387.046 650.087 352.047 844.012 120.981 11.772 µs -0.07116 8.887
Server Offset 2001:470:e815::8 (spidey.rellim.com) -946.241 -607.503 -448.819 -46.186 199.561 362.419 669.132 648.380 969.922 197.077 -61.710 µs -0.6179 5.108
Server Offset 204.17.205.1 -614.784 -455.854 -388.899 -7.540 191.243 317.037 441.697 580.142 772.891 173.763 -27.358 µs -0.6668 3.443
Server Offset 204.17.205.17 -586.772 -290.193 -130.696 28.084 177.520 259.802 428.269 308.216 549.995 103.203 20.032 µs -0.8904 8.153
Server Offset 204.17.205.30 -579.156 -425.403 -200.783 -12.972 134.920 407.092 494.551 335.703 832.495 117.267 -13.913 µs -0.377 9.262
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -4.097 -3.846 0.883 5.075 6.058 6.412 6.506 5.175 10.258 1.860 4.655 ms -2.963 11.99
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -9.858 -9.675 -5.536 -0.542 0.103 0.434 0.451 5.639 10.108 2.024 -1.185 ms -2.821 10.52
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -8.339 -8.333 -3.614 0.530 1.017 1.322 1.404 4.631 9.655 1.965 -0.179 ms -2.539 9.048
Server Offset 2606:4700:f1::123 (time.cloudflare.com) 0.110 0.187 0.319 0.531 0.840 1.000 1.053 0.521 0.813 0.164 0.544 ms 0.4047 3.693
Server Offset SHM(0) -184.199 -147.365 -135.729 -126.985 -122.512 -121.008 -118.891 13.216 26.357 4.478 -127.574 ms -2.853 18.56
TDOP 0.750 0.860 0.940 1.510 3.400 4.520 27.470 2.460 3.660 0.825 1.705 4.65 78.56
Temp /dev/nvme0n1 63.000 65.000 67.000 70.000 71.000 73.000 73.000 4.000 8.000 1.387 70.076 °C
Temp /dev/nvme1n1 50.000 50.000 51.000 51.000 54.000 56.000 57.000 3.000 6.000 1.186 51.757 °C
Temp /dev/sda 45.000 45.000 46.000 48.000 49.000 49.000 49.000 3.000 4.000 1.139 47.538 °C
Temp /dev/sdb 34.000 34.000 34.000 36.000 37.000 38.000 38.000 3.000 4.000 0.943 35.580 °C
Temp LM0 49.000 49.000 50.000 54.000 58.000 59.000 59.000 8.000 10.000 2.746 54.208 °C
Temp LM1 37.875 38.000 38.500 55.000 76.875 78.375 78.625 38.375 40.375 15.744 55.800 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 26.000 26.000 0.000 1.000 0.208 25.045 °C
Temp LM11 62.000 62.000 62.000 63.000 64.000 64.000 64.000 2.000 2.000 0.595 63.118 °C
Temp LM12 4.000 5.000 8.000 16.000 28.000 32.000 35.000 20.000 27.000 7.188 16.642 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 26.000 26.000 0.000 1.000 0.117 25.014 °C
Temp LM14 44.000 44.000 44.000 45.000 46.000 46.000 47.000 2.000 2.000 0.628 45.108 °C
Temp LM15 33.000 34.000 34.000 44.000 65.000 67.000 67.000 31.000 33.000 12.739 47.299 °C
Temp LM16 67.500 67.500 67.500 68.500 69.500 69.500 69.500 2.000 2.000 0.504 68.444 °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 37.750 38.000 38.500 51.750 76.250 79.000 80.250 37.750 41.000 15.115 54.911 °C
Temp LM20 37.875 38.000 38.500 55.000 76.875 78.375 78.625 38.375 40.375 15.722 55.778 °C
Temp LM21 67.500 67.750 67.750 68.500 69.500 69.750 69.750 1.750 2.000 0.488 68.566 °C
Temp LM22 34.000 34.000 34.000 36.000 37.000 38.000 38.000 3.000 4.000 0.938 35.674 °C
Temp LM23 62.850 64.850 66.850 69.850 70.850 71.850 72.850 4.000 7.000 1.386 69.965 °C
Temp LM3 45.000 45.000 46.000 48.000 49.000 49.000 49.000 3.000 4.000 1.079 47.545 °C
Temp LM4 49.850 49.850 50.850 50.850 53.850 56.850 56.850 3.000 7.000 1.209 51.607 °C
Temp LM5 49.850 49.850 50.850 50.850 53.850 56.850 56.850 3.000 7.000 1.217 51.624 °C
Temp LM6 57.850 57.850 58.850 59.850 66.850 72.850 74.850 8.000 15.000 2.806 61.343 °C
Temp LM7 49.850 49.850 50.850 50.850 53.850 56.850 56.850 3.000 7.000 1.203 51.610 °C
Temp LM8 44.000 44.000 44.000 45.000 46.000 46.000 47.000 2.000 2.000 0.634 45.108 °C
Temp LM9 33.500 34.000 34.500 40.500 51.500 52.000 52.500 17.000 18.000 6.693 41.644 °C
nSats 4.000 6.000 7.000 10.000 12.000 13.000 14.000 5.000 7.000 1.522 9.676 nSat 0.05632 2.775
Summary as CSV file


This server:

Motherboard:
OS: Gentoo unstable
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.



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