NTPsec

Kong

Report generated: Tue Jul 23 13:59:01 2024 UTC
Start Time: Tue Jul 16 13:59:00 2024 UTC
End Time: Tue Jul 23 13:59:00 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 -333.921 -94.316 -42.903 -2.784 37.328 136.700 335.778 80.231 231.016 35.732 -2.097 µs -3.232 27.85
Local Clock Frequency Offset 12.103 12.242 12.889 13.359 14.228 14.282 14.364 1.339 2.040 0.372 13.367 ppm 4.258e+04 1.489e+06

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

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



Local RMS Time Jitter

local jitter plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Time Jitter 0.119 9.595 11.685 20.225 39.088 70.895 127.045 27.403 61.300 10.937 22.361 µs 7.805 45.62

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

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

RMS jitter is field 5 in the loopstats log file.



Local RMS Frequency Jitter

local stability plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Frequency Jitter 0.000 4.285 5.440 10.104 46.240 86.276 107.851 40.800 81.991 14.455 14.609 ppb 3.402 15.87

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 -333.921 -94.316 -42.903 -2.784 37.328 136.700 335.778 80.231 231.016 35.732 -2.097 µs -3.232 27.85

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 12.103 12.242 12.889 13.359 14.228 14.282 14.364 1.339 2.040 0.372 13.367 ppm 4.258e+04 1.489e+06
Temp /dev/sda 49.000 49.000 52.000 54.000 56.000 58.000 59.000 4.000 9.000 1.501 54.123 °C
Temp /dev/sdb 38.000 38.000 41.000 44.000 46.000 48.000 49.000 5.000 10.000 1.559 43.646 °C
Temp LM0 49.000 49.000 50.000 53.000 58.000 59.000 60.000 8.000 10.000 2.752 53.563 °C
Temp LM1 44.250 45.375 48.500 51.250 77.750 80.625 90.000 29.250 35.250 8.409 53.989 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.083 25.007 °C
Temp LM11 63.000 64.000 65.000 66.000 67.000 67.000 68.000 2.000 3.000 0.674 66.264 °C
Temp LM12 2.000 4.000 5.000 9.000 13.000 15.000 25.000 8.000 11.000 2.621 8.612 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 26.000 26.000 0.000 1.000 0.148 25.022 °C
Temp LM14 46.000 46.000 48.000 50.000 50.000 51.000 51.000 2.000 5.000 0.836 49.498 °C
Temp LM15 38.000 39.000 42.000 44.000 66.000 69.000 79.000 24.000 30.000 7.043 46.098 °C
Temp LM16 68.500 68.500 70.000 71.500 72.000 72.500 72.500 2.000 4.000 0.662 71.232 °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 44.000 45.750 48.250 51.750 77.000 80.750 89.000 28.750 35.000 8.202 54.280 °C
Temp LM20 44.250 45.500 48.500 51.250 77.750 80.500 90.000 29.250 35.000 8.393 53.958 °C
Temp LM21 68.500 68.875 70.250 71.500 72.125 72.500 72.875 1.875 3.625 0.637 71.371 °C
Temp LM22 0.000 39.000 41.000 44.000 46.000 48.000 48.000 5.000 9.000 1.823 43.576 °C
Temp LM23 64.850 66.850 67.850 71.850 74.850 76.850 77.850 7.000 10.000 2.363 71.490 °C
Temp LM3 48.000 49.000 52.000 54.000 57.000 58.000 59.000 5.000 9.000 1.506 54.133 °C
Temp LM4 50.850 51.850 52.850 54.850 55.850 58.850 59.850 3.000 7.000 1.021 54.436 °C
Temp LM5 50.850 51.850 52.850 54.850 55.850 58.850 59.850 3.000 7.000 1.012 54.449 °C
Temp LM6 58.850 60.850 61.850 63.850 66.850 74.850 80.850 5.000 14.000 2.137 63.909 °C
Temp LM7 50.850 51.850 52.850 54.850 55.850 58.850 59.850 3.000 7.000 1.020 54.452 °C
Temp LM8 46.000 46.000 48.000 50.000 50.000 51.000 51.000 2.000 5.000 0.835 49.499 °C
Temp LM9 38.000 39.000 42.000 44.000 55.500 56.000 60.000 13.500 17.000 3.613 45.087 °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 8.000 9.000 11.000 14.000 15.000 18.000 5.000 7.000 1.728 11.305 nSat 186.7 1130
TDOP 0.700 0.870 0.970 1.420 2.500 3.770 14.010 1.530 2.900 0.560 1.547 13.75 73.12

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) -407.572 -0.085 -0.045 0.018 0.071 0.240 0.612 0.116 0.325 7.042 -0.127 ms -56.29 3081

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) -407.483 -0.710 -0.211 -0.025 0.198 0.620 1.550 0.408 1.329 13.850 -0.592 ms -30.72 854.6

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) -1.631 -1.488 -1.267 0.627 1.067 1.265 1.736 2.334 2.753 0.877 0.199 ms -3.517 8.068

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 -408.105 -0.938 -0.283 -0.020 0.184 0.239 0.322 0.466 1.177 7.040 -0.184 ms -56.38 3089

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 -407.772 -0.117 -0.060 0.002 0.059 0.158 0.393 0.120 0.275 11.918 -0.417 ms -35.01 1133

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 -407.827 -0.492 -0.093 -0.031 0.012 0.103 0.403 0.105 0.596 10.160 -0.344 ms -40.36 1531

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) -401.235 3.724 4.353 5.912 7.008 7.325 7.696 2.656 3.601 10.389 5.496 ms -36.59 1368

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) -405.408 -8.733 -0.548 1.265 2.240 2.632 3.125 2.788 11.364 10.246 0.692 ms -38.64 1453

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) -0.228 0.201 0.561 2.132 2.573 2.736 3.439 2.013 2.535 0.566 1.971 ms 21.04 63.52

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::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) -0.155 0.150 0.460 2.187 2.641 2.808 3.089 2.182 2.658 0.654 1.984 ms 12.98 33.72

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) -538.632 -143.997 -139.830 -131.472 -126.042 -123.887 -121.003 13.787 20.110 4.717 -131.929 ms -2.441e+04 7.129e+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) 0.000 3.151 4.697 15.556 66.573 97.085 2,697.842 61.876 93.934 76.135 25.638 µs 27.96 952.6

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 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) 0.000 2.000 2.919 8.102 36.387 91.284 1,629.585 33.468 89.284 38.836 13.602 µs 28.78 1107

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) 0.112 0.188 0.269 0.750 4.235 11.065 15.934 3.966 10.877 1.924 1.282 ms 3.308 18.99

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 0.000 2.321 3.575 12.260 34.454 68.954 174.435 30.879 66.633 13.148 15.237 µs 4.755 38.77

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 0.000 3.727 5.700 16.100 60.823 104.069 3,020.809 55.123 100.342 66.995 23.620 µs 37.96 1673

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 0.000 1.938 3.476 12.628 46.905 122.796 2,166.285 43.429 120.858 61.281 20.042 µs 23.27 744

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) 0.000 0.225 0.360 1.701 5.693 11.840 29.388 5.333 11.616 2.542 2.394 ms 4.555 38.59

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) 0.000 0.176 0.273 0.678 2.577 7.105 103.276 2.305 6.929 3.447 1.074 ms 24.08 708.9

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 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) 0.000 0.170 0.228 0.487 1.336 4.324 5.765 1.108 4.154 0.650 0.643 ms 4.962 32.84

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) 0.000 0.162 0.218 0.475 1.346 2.850 13.981 1.127 2.688 0.684 0.623 ms 8.575 128.1

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) 0.000 0.301 0.441 1.222 8.564 11.460 408.260 8.123 11.160 4.616 2.480 ms 36.26 2431

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 12.103 12.242 12.889 13.359 14.228 14.282 14.364 1.339 2.040 0.372 13.367 ppm 4.258e+04 1.489e+06
Local Clock Time Offset -333.921 -94.316 -42.903 -2.784 37.328 136.700 335.778 80.231 231.016 35.732 -2.097 µs -3.232 27.85
Local RMS Frequency Jitter 0.000 4.285 5.440 10.104 46.240 86.276 107.851 40.800 81.991 14.455 14.609 ppb 3.402 15.87
Local RMS Time Jitter 0.119 9.595 11.685 20.225 39.088 70.895 127.045 27.403 61.300 10.937 22.361 µs 7.805 45.62
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 3.151 4.697 15.556 66.573 97.085 2,697.842 61.876 93.934 76.135 25.638 µs 27.96 952.6
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 0.000 2.000 2.919 8.102 36.387 91.284 1,629.585 33.468 89.284 38.836 13.602 µs 28.78 1107
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.112 0.188 0.269 0.750 4.235 11.065 15.934 3.966 10.877 1.924 1.282 ms 3.308 18.99
Server Jitter 204.17.205.1 0.000 2.321 3.575 12.260 34.454 68.954 174.435 30.879 66.633 13.148 15.237 µs 4.755 38.77
Server Jitter 204.17.205.16 0.000 3.727 5.700 16.100 60.823 104.069 3,020.809 55.123 100.342 66.995 23.620 µs 37.96 1673
Server Jitter 204.17.205.30 0.000 1.938 3.476 12.628 46.905 122.796 2,166.285 43.429 120.858 61.281 20.042 µs 23.27 744
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.000 0.225 0.360 1.701 5.693 11.840 29.388 5.333 11.616 2.542 2.394 ms 4.555 38.59
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.000 0.176 0.273 0.678 2.577 7.105 103.276 2.305 6.929 3.447 1.074 ms 24.08 708.9
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.000 0.170 0.228 0.487 1.336 4.324 5.765 1.108 4.154 0.650 0.643 ms 4.962 32.84
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.000 0.162 0.218 0.475 1.346 2.850 13.981 1.127 2.688 0.684 0.623 ms 8.575 128.1
Server Jitter SHM(0) 0.000 0.301 0.441 1.222 8.564 11.460 408.260 8.123 11.160 4.616 2.480 ms 36.26 2431
Server Offset 2001:470:e815::24 (pi4.rellim.com) -407.572 -0.085 -0.045 0.018 0.071 0.240 0.612 0.116 0.325 7.042 -0.127 ms -56.29 3081
Server Offset 2001:470:e815::8 (spidey.rellim.com) -407.483 -0.710 -0.211 -0.025 0.198 0.620 1.550 0.408 1.329 13.850 -0.592 ms -30.72 854.6
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -1.631 -1.488 -1.267 0.627 1.067 1.265 1.736 2.334 2.753 0.877 0.199 ms -3.517 8.068
Server Offset 204.17.205.1 -408.105 -0.938 -0.283 -0.020 0.184 0.239 0.322 0.466 1.177 7.040 -0.184 ms -56.38 3089
Server Offset 204.17.205.16 -407.772 -0.117 -0.060 0.002 0.059 0.158 0.393 0.120 0.275 11.918 -0.417 ms -35.01 1133
Server Offset 204.17.205.30 -407.827 -0.492 -0.093 -0.031 0.012 0.103 0.403 0.105 0.596 10.160 -0.344 ms -40.36 1531
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -401.235 3.724 4.353 5.912 7.008 7.325 7.696 2.656 3.601 10.389 5.496 ms -36.59 1368
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -405.408 -8.733 -0.548 1.265 2.240 2.632 3.125 2.788 11.364 10.246 0.692 ms -38.64 1453
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -0.228 0.201 0.561 2.132 2.573 2.736 3.439 2.013 2.535 0.566 1.971 ms 21.04 63.52
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -0.155 0.150 0.460 2.187 2.641 2.808 3.089 2.182 2.658 0.654 1.984 ms 12.98 33.72
Server Offset SHM(0) -538.632 -143.997 -139.830 -131.472 -126.042 -123.887 -121.003 13.787 20.110 4.717 -131.929 ms -2.441e+04 7.129e+05
TDOP 0.700 0.870 0.970 1.420 2.500 3.770 14.010 1.530 2.900 0.560 1.547 13.75 73.12
Temp /dev/sda 49.000 49.000 52.000 54.000 56.000 58.000 59.000 4.000 9.000 1.501 54.123 °C
Temp /dev/sdb 38.000 38.000 41.000 44.000 46.000 48.000 49.000 5.000 10.000 1.559 43.646 °C
Temp LM0 49.000 49.000 50.000 53.000 58.000 59.000 60.000 8.000 10.000 2.752 53.563 °C
Temp LM1 44.250 45.375 48.500 51.250 77.750 80.625 90.000 29.250 35.250 8.409 53.989 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.083 25.007 °C
Temp LM11 63.000 64.000 65.000 66.000 67.000 67.000 68.000 2.000 3.000 0.674 66.264 °C
Temp LM12 2.000 4.000 5.000 9.000 13.000 15.000 25.000 8.000 11.000 2.621 8.612 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 26.000 26.000 0.000 1.000 0.148 25.022 °C
Temp LM14 46.000 46.000 48.000 50.000 50.000 51.000 51.000 2.000 5.000 0.836 49.498 °C
Temp LM15 38.000 39.000 42.000 44.000 66.000 69.000 79.000 24.000 30.000 7.043 46.098 °C
Temp LM16 68.500 68.500 70.000 71.500 72.000 72.500 72.500 2.000 4.000 0.662 71.232 °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 44.000 45.750 48.250 51.750 77.000 80.750 89.000 28.750 35.000 8.202 54.280 °C
Temp LM20 44.250 45.500 48.500 51.250 77.750 80.500 90.000 29.250 35.000 8.393 53.958 °C
Temp LM21 68.500 68.875 70.250 71.500 72.125 72.500 72.875 1.875 3.625 0.637 71.371 °C
Temp LM22 0.000 39.000 41.000 44.000 46.000 48.000 48.000 5.000 9.000 1.823 43.576 °C
Temp LM23 64.850 66.850 67.850 71.850 74.850 76.850 77.850 7.000 10.000 2.363 71.490 °C
Temp LM3 48.000 49.000 52.000 54.000 57.000 58.000 59.000 5.000 9.000 1.506 54.133 °C
Temp LM4 50.850 51.850 52.850 54.850 55.850 58.850 59.850 3.000 7.000 1.021 54.436 °C
Temp LM5 50.850 51.850 52.850 54.850 55.850 58.850 59.850 3.000 7.000 1.012 54.449 °C
Temp LM6 58.850 60.850 61.850 63.850 66.850 74.850 80.850 5.000 14.000 2.137 63.909 °C
Temp LM7 50.850 51.850 52.850 54.850 55.850 58.850 59.850 3.000 7.000 1.020 54.452 °C
Temp LM8 46.000 46.000 48.000 50.000 50.000 51.000 51.000 2.000 5.000 0.835 49.499 °C
Temp LM9 38.000 39.000 42.000 44.000 55.500 56.000 60.000 13.500 17.000 3.613 45.087 °C
nSats 4.000 8.000 9.000 11.000 14.000 15.000 18.000 5.000 7.000 1.728 11.305 nSat 186.7 1130
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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