NTPsec

Kong

Report generated: Thu Mar 6 14:59:01 2025 UTC
Start Time: Thu Feb 27 14:59:00 2025 UTC
End Time: Thu Mar 6 14:59:00 2025 UTC
Report Period: 7.0 days

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

Local Clock Time/Frequency Offsets

local offset plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Time Offset -2,008.168 -193.114 -54.815 -2.564 46.022 163.767 4,494.229 100.837 356.881 177.241 3.017 µs 17.04 399.7
Local Clock Frequency Offset 11.494 11.540 11.586 11.839 12.295 13.752 18.541 0.708 2.212 0.387 11.879 ppm 6.821 83.5

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 8.408 10.563 12.888 25.133 54.629 226.016 1,221.136 41.742 215.453 70.414 34.843 µs 11.09 143

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 2.986 4.874 6.234 13.491 51.551 199.717 1,455.664 45.317 194.843 78.638 24.764 ppb 12.65 186.3

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 -2,008.168 -193.114 -54.815 -2.564 46.022 163.767 4,494.229 100.837 356.881 177.241 3.017 µs 17.04 399.7

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 11.494 11.540 11.586 11.839 12.295 13.752 18.541 0.708 2.212 0.387 11.879 ppm 6.821 83.5
Temp /dev/sda 45.000 45.000 45.000 47.000 49.000 50.000 51.000 4.000 5.000 1.419 47.207 °C
Temp /dev/sdb 33.000 33.000 33.000 35.000 37.000 38.000 39.000 4.000 5.000 1.220 35.124 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 58.000 59.000 8.000 9.000 2.565 54.646 °C
Temp LM1 37.375 38.000 39.125 42.375 51.475 74.485 84.375 12.350 36.485 5.599 43.508 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 25.000 0.000 0.000 0.000 25.000 °C
Temp LM11 61.000 62.000 62.000 63.000 64.000 64.000 64.000 2.000 2.000 0.574 62.839 °C
Temp LM12 3.000 4.000 6.000 15.000 23.000 27.000 43.000 17.000 23.000 5.098 14.665 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 25.000 0.000 0.000 0.000 25.000 °C
Temp LM14 43.000 43.000 44.000 45.000 46.000 46.000 46.000 2.000 3.000 0.724 44.587 °C
Temp LM15 32.000 33.000 34.000 36.000 40.000 63.000 73.000 6.000 30.000 4.313 36.983 °C
Temp LM16 66.500 67.000 67.500 68.000 69.000 69.000 69.500 1.500 2.000 0.456 68.104 °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 37.250 38.030 39.500 42.750 50.000 73.750 82.250 10.500 35.720 5.320 43.798 °C
Temp LM20 37.375 38.000 39.075 42.375 50.925 74.485 84.375 11.850 36.485 5.585 43.490 °C
Temp LM21 66.750 67.140 67.625 68.250 69.000 69.250 69.500 1.375 2.110 0.435 68.244 °C
Temp LM22 33.000 33.000 33.000 35.000 37.000 38.000 39.000 4.000 5.000 1.171 35.165 °C
Temp LM23 63.850 65.850 67.850 70.850 71.850 71.850 72.850 4.000 6.000 1.236 70.236 °C
Temp LM3 44.000 45.000 45.000 47.000 49.000 50.000 51.000 4.000 5.000 1.406 47.203 °C
Temp LM4 48.850 48.850 49.850 50.850 51.850 54.850 58.850 2.000 6.000 0.779 51.004 °C
Temp LM5 48.850 48.850 49.850 50.850 51.850 54.730 58.850 2.000 5.880 0.780 51.012 °C
Temp LM6 55.850 56.850 57.850 59.850 61.850 68.730 74.850 4.000 11.880 1.769 59.706 °C
Temp LM7 48.850 48.850 49.850 50.850 51.850 54.850 58.850 2.000 6.000 0.785 51.020 °C
Temp LM8 43.000 43.000 44.000 45.000 46.000 46.000 46.000 2.000 3.000 0.723 44.587 °C
Temp LM9 33.000 33.500 34.500 36.500 39.000 50.500 53.000 4.500 17.000 2.337 36.808 °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 4.000 5.000 7.000 10.000 11.000 12.000 5.000 7.000 1.493 7.351 nSat -0.1274 2.813
TDOP 0.780 0.990 1.160 1.940 6.100 15.290 128.810 4.940 14.300 3.427 2.723 12.6 281

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

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

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



Server Offsets

peer offsets plot

The offset of all refclocks and servers. This can be useful to see if offset changes are happening in a single clock or all clocks together.

Clock Offset is field 5 in the peerstats log file.



Server Offset 2001:470:e815::24 (pi4.rellim.com)

peer offset 2001:470:e815::24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2001:470:e815::24 (pi4.rellim.com) -2.405 -0.304 -0.069 0.016 0.081 0.147 24.152 0.150 0.451 0.443 0.021 ms 45.02 2364

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 2001:470:e815::8 (spidey.rellim.com)

peer offset 2001:470:e815::8 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2001:470:e815::8 (spidey.rellim.com) -2.563 -0.695 -0.557 0.033 0.417 2.010 4.418 0.974 2.705 0.463 0.052 ms 4.691 40.03

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 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) -3.074 -1.328 -1.123 -0.867 -0.562 -0.384 3.447 0.561 0.944 0.257 -0.852 ms 5.649 104.3

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.1

peer offset 204.17.205.1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.1 -3.393 -1.113 -0.751 0.073 0.646 1.357 4.207 1.397 2.471 0.512 0.060 ms 1.934 19.39

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Offset 204.17.205.30

peer offset 204.17.205.30 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.30 -1,917.050 -221.840 -89.463 -30.067 43.071 663.011 4,575.556 132.534 884.851 263.257 -7.678 µs 11.71 181.3

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) -40.065 -0.606 -0.291 0.105 0.537 0.799 4.442 0.828 1.405 2.325 -0.012 ms -16.71 285.8

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) -2.963 -1.008 -0.828 -0.434 0.093 0.255 3.817 0.921 1.264 0.340 -0.397 ms 2.507 37.49

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



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

peer offset 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.499 0.194 0.400 0.642 0.894 1.156 5.281 0.494 0.962 0.310 0.656 ms 7.514 124.1

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) -0.449 0.152 0.368 0.680 1.191 1.338 1.400 0.823 1.186 0.248 0.701 ms 0.2728 4.25

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) -377.789 -131.197 -129.568 -125.237 -121.051 -119.657 -116.822 8.517 11.540 3.153 -125.299 ms -17.3 1196

The offset of a server in seconds. This is useful to see how the measured offset is behaving.

The chart also plots offset±rtt, where rtt is the round trip time to the server. NTP can not really know the offset of a remote chimer, NTP computes it by subtracting rtt/2 from the offset. Plotting the offset±rtt reverses this calculation to more easily see the effects of rtt changes.

Closer to 0s is better. An ideal system would be a horizontal line at 0s. Typical 90% ranges may be: local LAN server 80µs; 90% ranges for WAN server may be 4ms and much larger.

Clock Offset is field 5 in the peerstats log file. The Round Trip Time (rtt) is field 6 in the peerstats log file.



Server Jitters

peer jitters plot

The RMS Jitter of all refclocks and servers. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 2001:470:e815::24 (pi4.rellim.com)

peer jitter 2001:470:e815::24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 0.004 0.006 0.021 0.115 0.175 15.683 0.109 0.171 0.379 0.052 ms 28.39 964

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) 1.582 3.036 4.373 14.829 113.792 190.215 2,272.557 109.419 187.179 65.416 28.367 µs 18.23 504.4

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 2001:67c: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) 0.103 0.165 0.240 0.570 3.352 7.049 112.764 3.111 6.884 3.992 1.157 ms 17.86 407.7

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 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 1.302 3.118 5.086 22.509 121.794 191.731 1,764.735 116.708 188.613 58.918 36.320 µs 13.67 334.5

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 3.332 5.741 8.267 22.381 133.035 822.240 2,852.354 124.768 816.499 182.088 57.154 µs 9.645 113.3

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



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

peer jitter 2405:fc00::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.099 0.171 0.240 0.561 2.125 4.652 46.312 1.885 4.481 2.309 0.951 ms 13.63 219.9

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 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) 0.083 0.174 0.238 0.532 1.854 6.889 12.467 1.616 6.715 1.085 0.794 ms 6.49 54.88

The RMS Jitter of a server. Jitter is the current estimated dispersion, in other words the variation in offset between samples.

Closer to 0s is better. An ideal system would be a horizontal line at 0s.

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 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) 0.069 0.148 0.220 0.459 1.159 2.590 58.421 0.940 2.442 2.979 0.722 ms 18.05 344.5

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) 0.096 0.141 0.214 0.456 1.317 5.700 30.930 1.103 5.559 1.552 0.668 ms 15.03 278.4

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) 0.000 0.259 0.363 0.894 2.374 5.212 187.108 2.011 4.952 2.259 1.162 ms 41.22 2406

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 11.494 11.540 11.586 11.839 12.295 13.752 18.541 0.708 2.212 0.387 11.879 ppm 6.821 83.5
Local Clock Time Offset -2,008.168 -193.114 -54.815 -2.564 46.022 163.767 4,494.229 100.837 356.881 177.241 3.017 µs 17.04 399.7
Local RMS Frequency Jitter 2.986 4.874 6.234 13.491 51.551 199.717 1,455.664 45.317 194.843 78.638 24.764 ppb 12.65 186.3
Local RMS Time Jitter 8.408 10.563 12.888 25.133 54.629 226.016 1,221.136 41.742 215.453 70.414 34.843 µs 11.09 143
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 0.004 0.006 0.021 0.115 0.175 15.683 0.109 0.171 0.379 0.052 ms 28.39 964
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 1.582 3.036 4.373 14.829 113.792 190.215 2,272.557 109.419 187.179 65.416 28.367 µs 18.23 504.4
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.103 0.165 0.240 0.570 3.352 7.049 112.764 3.111 6.884 3.992 1.157 ms 17.86 407.7
Server Jitter 204.17.205.1 1.302 3.118 5.086 22.509 121.794 191.731 1,764.735 116.708 188.613 58.918 36.320 µs 13.67 334.5
Server Jitter 204.17.205.30 3.332 5.741 8.267 22.381 133.035 822.240 2,852.354 124.768 816.499 182.088 57.154 µs 9.645 113.3
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.099 0.171 0.240 0.561 2.125 4.652 46.312 1.885 4.481 2.309 0.951 ms 13.63 219.9
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.083 0.174 0.238 0.532 1.854 6.889 12.467 1.616 6.715 1.085 0.794 ms 6.49 54.88
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.069 0.148 0.220 0.459 1.159 2.590 58.421 0.940 2.442 2.979 0.722 ms 18.05 344.5
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.096 0.141 0.214 0.456 1.317 5.700 30.930 1.103 5.559 1.552 0.668 ms 15.03 278.4
Server Jitter SHM(0) 0.000 0.259 0.363 0.894 2.374 5.212 187.108 2.011 4.952 2.259 1.162 ms 41.22 2406
Server Offset 2001:470:e815::24 (pi4.rellim.com) -2.405 -0.304 -0.069 0.016 0.081 0.147 24.152 0.150 0.451 0.443 0.021 ms 45.02 2364
Server Offset 2001:470:e815::8 (spidey.rellim.com) -2.563 -0.695 -0.557 0.033 0.417 2.010 4.418 0.974 2.705 0.463 0.052 ms 4.691 40.03
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -3.074 -1.328 -1.123 -0.867 -0.562 -0.384 3.447 0.561 0.944 0.257 -0.852 ms 5.649 104.3
Server Offset 204.17.205.1 -3.393 -1.113 -0.751 0.073 0.646 1.357 4.207 1.397 2.471 0.512 0.060 ms 1.934 19.39
Server Offset 204.17.205.30 -1,917.050 -221.840 -89.463 -30.067 43.071 663.011 4,575.556 132.534 884.851 263.257 -7.678 µs 11.71 181.3
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -40.065 -0.606 -0.291 0.105 0.537 0.799 4.442 0.828 1.405 2.325 -0.012 ms -16.71 285.8
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -2.963 -1.008 -0.828 -0.434 0.093 0.255 3.817 0.921 1.264 0.340 -0.397 ms 2.507 37.49
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.499 0.194 0.400 0.642 0.894 1.156 5.281 0.494 0.962 0.310 0.656 ms 7.514 124.1
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -0.449 0.152 0.368 0.680 1.191 1.338 1.400 0.823 1.186 0.248 0.701 ms 0.2728 4.25
Server Offset SHM(0) -377.789 -131.197 -129.568 -125.237 -121.051 -119.657 -116.822 8.517 11.540 3.153 -125.299 ms -17.3 1196
TDOP 0.780 0.990 1.160 1.940 6.100 15.290 128.810 4.940 14.300 3.427 2.723 12.6 281
Temp /dev/sda 45.000 45.000 45.000 47.000 49.000 50.000 51.000 4.000 5.000 1.419 47.207 °C
Temp /dev/sdb 33.000 33.000 33.000 35.000 37.000 38.000 39.000 4.000 5.000 1.220 35.124 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 58.000 59.000 8.000 9.000 2.565 54.646 °C
Temp LM1 37.375 38.000 39.125 42.375 51.475 74.485 84.375 12.350 36.485 5.599 43.508 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 25.000 0.000 0.000 0.000 25.000 °C
Temp LM11 61.000 62.000 62.000 63.000 64.000 64.000 64.000 2.000 2.000 0.574 62.839 °C
Temp LM12 3.000 4.000 6.000 15.000 23.000 27.000 43.000 17.000 23.000 5.098 14.665 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 25.000 0.000 0.000 0.000 25.000 °C
Temp LM14 43.000 43.000 44.000 45.000 46.000 46.000 46.000 2.000 3.000 0.724 44.587 °C
Temp LM15 32.000 33.000 34.000 36.000 40.000 63.000 73.000 6.000 30.000 4.313 36.983 °C
Temp LM16 66.500 67.000 67.500 68.000 69.000 69.000 69.500 1.500 2.000 0.456 68.104 °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 37.250 38.030 39.500 42.750 50.000 73.750 82.250 10.500 35.720 5.320 43.798 °C
Temp LM20 37.375 38.000 39.075 42.375 50.925 74.485 84.375 11.850 36.485 5.585 43.490 °C
Temp LM21 66.750 67.140 67.625 68.250 69.000 69.250 69.500 1.375 2.110 0.435 68.244 °C
Temp LM22 33.000 33.000 33.000 35.000 37.000 38.000 39.000 4.000 5.000 1.171 35.165 °C
Temp LM23 63.850 65.850 67.850 70.850 71.850 71.850 72.850 4.000 6.000 1.236 70.236 °C
Temp LM3 44.000 45.000 45.000 47.000 49.000 50.000 51.000 4.000 5.000 1.406 47.203 °C
Temp LM4 48.850 48.850 49.850 50.850 51.850 54.850 58.850 2.000 6.000 0.779 51.004 °C
Temp LM5 48.850 48.850 49.850 50.850 51.850 54.730 58.850 2.000 5.880 0.780 51.012 °C
Temp LM6 55.850 56.850 57.850 59.850 61.850 68.730 74.850 4.000 11.880 1.769 59.706 °C
Temp LM7 48.850 48.850 49.850 50.850 51.850 54.850 58.850 2.000 6.000 0.785 51.020 °C
Temp LM8 43.000 43.000 44.000 45.000 46.000 46.000 46.000 2.000 3.000 0.723 44.587 °C
Temp LM9 33.000 33.500 34.500 36.500 39.000 50.500 53.000 4.500 17.000 2.337 36.808 °C
nSats 4.000 4.000 5.000 7.000 10.000 11.000 12.000 5.000 7.000 1.493 7.351 nSat -0.1274 2.813
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 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". See [NIST1]
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. See [NIST2]
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.
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. See [NIST1]. There are other different ways to calculate Skewness.
Some have said: "The qualitative interpretation of the skew is complicated and unintuitive".
A normal distribution has a skewness of zero.
time offset:
The difference between the ntpd calculated time and the local system clock's time. Also called phase offset.
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.

References:

[NIST1]: NIST/SEMATECH e-Handbook of Statistical Methods, 2012
1.3.5.11. Measures of Skewness and Kurtosis
https://www.itl.nist.gov/div898/handbook/eda/section3/eda35b.htm
[NIST]}: NIST/SEMATECH e-Handbook of Statistical Methods, 2012
7.2.6.2. Percentiles
https://www.itl.nist.gov/div898/handbook/prc/section2/prc262.htm


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