NTPsec

Kong

Report generated: Tue Mar 25 13:59:01 2025 UTC
Start Time: Tue Mar 18 13:59:00 2025 UTC
End Time: Tue Mar 25 13:59:00 2025 UTC
Report Period: 7.0 days

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

Local Clock Time/Frequency Offsets

local offset plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Time Offset -1,922.489 -271.150 -80.889 -1.836 71.663 219.276 1,183.189 152.552 490.426 94.215 -3.617 µs -9.195 159.5
Local Clock Frequency Offset 11.339 11.419 11.505 11.784 12.585 13.614 13.940 1.080 2.195 0.377 11.860 ppm 2.826e+04 8.63e+05

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

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



Local RMS Time Jitter

local jitter plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Time Jitter 0.060 12.418 15.555 30.714 88.830 203.224 429.755 73.275 190.806 34.752 39.213 µs 5.608 43.61

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 6.248 8.238 16.940 84.275 161.518 398.374 76.037 155.270 32.307 26.648 ppb 4.377 34.56

The RMS Frequency Jitter (aka wander) of the local clock's frequency. In other words, how fast the local clock changes frequency.

Lower is better. An ideal clock would be a horizontal line at 0ppm.

RMS Frequency Jitter is field 6 in the loopstats log file.



Local Clock Time Offset Histogram

local offset histogram plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Offset -1,922.489 -271.150 -80.889 -1.836 71.663 219.276 1,183.189 152.552 490.426 94.215 -3.617 µs -9.195 159.5

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 11.339 11.419 11.505 11.784 12.585 13.614 13.940 1.080 2.195 0.377 11.860 ppm 2.826e+04 8.63e+05
Temp /dev/sda 44.000 45.000 45.000 48.000 49.000 50.000 51.000 4.000 5.000 1.270 47.340 °C
Temp /dev/sdb 32.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.411 35.519 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 58.000 59.000 8.000 9.000 2.620 54.526 °C
Temp LM1 36.125 37.125 37.875 42.000 53.500 75.000 83.375 15.625 37.875 6.544 43.106 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.031 25.001 °C
Temp LM11 61.000 61.000 62.000 63.000 63.000 63.000 64.000 1.000 2.000 0.544 62.576 °C
Temp LM12 3.000 4.000 6.000 16.000 26.000 30.000 45.000 20.000 26.000 6.186 16.334 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.031 25.001 °C
Temp LM14 42.000 43.000 43.000 44.000 45.000 45.000 46.000 2.000 2.000 0.589 44.287 °C
Temp LM15 32.000 33.000 33.000 36.000 42.000 63.000 72.000 9.000 30.000 4.969 36.736 °C
Temp LM16 66.500 67.000 67.000 68.000 68.500 68.500 69.000 1.500 1.500 0.373 67.824 °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 36.250 37.250 38.000 42.500 52.000 73.750 83.500 14.000 36.500 6.094 43.367 °C
Temp LM20 36.125 37.125 37.875 42.000 53.250 75.000 83.375 15.375 37.875 6.535 43.095 °C
Temp LM21 66.500 67.000 67.250 68.000 68.500 68.750 69.125 1.250 1.750 0.344 67.960 °C
Temp LM22 33.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.379 35.587 °C
Temp LM23 63.850 64.850 66.850 69.850 70.850 71.850 72.850 4.000 7.000 1.372 69.784 °C
Temp LM3 44.000 45.000 45.000 48.000 49.000 50.000 52.000 4.000 5.000 1.267 47.332 °C
Temp LM4 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.798 50.829 °C
Temp LM5 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.783 50.844 °C
Temp LM6 55.850 56.850 57.850 58.850 61.850 69.850 74.850 4.000 13.000 2.014 59.463 °C
Temp LM7 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.775 50.847 °C
Temp LM8 42.000 43.000 43.000 44.000 45.000 45.000 46.000 2.000 2.000 0.588 44.286 °C
Temp LM9 32.000 33.000 33.500 36.500 40.500 50.500 51.500 7.000 17.500 2.780 36.420 °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 3.000 4.000 5.000 8.000 11.000 12.000 12.000 6.000 8.000 1.627 8.237 nSat 78.9 369.6
TDOP 0.870 0.900 1.030 1.640 6.400 35.110 92.800 5.370 34.210 7.210 3.244 5.284 52.38

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) -465.111 -0.479 -0.114 0.006 0.094 0.231 25.055 0.209 0.710 7.390 -0.118 ms -66.78 4207

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) -464.959 -0.891 -0.633 0.044 0.275 0.599 1.055 0.907 1.490 14.153 -0.458 ms -36.97 1218

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) -465.029 -1.003 -0.763 -0.445 -0.044 0.768 3.770 0.719 1.771 11.073 -0.688 ms -46.26 1942

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 -465.485 -1.063 -0.769 -0.022 0.406 0.572 1.152 1.175 1.634 7.172 -0.173 ms -68.87 4472

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 -465.412 -0.337 -0.101 -0.012 0.086 0.282 1.689 0.187 0.619 10.874 -0.266 ms -46.89 2011

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) -460.453 1.230 1.521 1.976 4.050 4.380 4.748 2.529 3.150 10.932 1.878 ms -45.17 1925

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) -464.435 -1.023 -0.831 -0.413 0.111 0.311 0.943 0.942 1.335 10.852 -0.640 ms -47.04 2013

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) -429.541 146.896 296.628 547.855 824.764 923.161 1,168.653 528.136 776.265 168.092 553.529 µs 18.43 61.47

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

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

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

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



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

peer offset 2606:4700:f1::123 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -1.373 -0.111 0.336 0.596 0.876 1.095 1.726 0.540 1.206 0.219 0.592 ms 8.191 32.92

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

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

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

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



Server Offset 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) -591.431 -143.117 -139.648 -127.321 -121.413 -119.331 -117.052 18.235 23.786 10.460 -128.028 ms -2395 3.512e+04

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 3.401 5.864 32.918 149.844 197.622 3,732.841 143.980 194.221 77.470 54.588 µs 26.46 1249

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 2.915 4.642 23.786 165.638 210.716 603.596 160.996 207.801 55.395 48.864 µs 1.381 6.338

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) 0.000 0.162 0.263 0.655 4.703 12.054 22.722 4.440 11.892 2.236 1.319 ms 3.676 26.45

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 3.300 5.534 29.221 164.982 209.913 626.299 159.448 206.613 54.934 52.405 µs 1.63 7.879

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 5.344 7.853 38.892 173.222 332.732 1,260.308 165.369 327.388 87.544 66.928 µs 5.715 62.62

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 0.195 0.268 0.709 3.186 9.416 105.669 2.918 9.221 5.642 1.514 ms 10.76 163

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 0.141 0.213 0.577 2.482 8.362 104.772 2.268 8.221 3.912 1.070 ms 19.72 502.4

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 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) 0.071 0.162 0.225 0.466 1.130 2.589 4.893 0.906 2.428 0.482 0.565 ms 6.411 52.56

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 0.155 0.215 0.477 1.623 3.065 17.145 1.407 2.910 0.724 0.650 ms 10.77 218.9

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 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 0.262 0.397 1.148 8.928 11.866 455.057 8.531 11.604 14.675 3.216 ms 18.63 467.5

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.



Summary


Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset 11.339 11.419 11.505 11.784 12.585 13.614 13.940 1.080 2.195 0.377 11.860 ppm 2.826e+04 8.63e+05
Local Clock Time Offset -1,922.489 -271.150 -80.889 -1.836 71.663 219.276 1,183.189 152.552 490.426 94.215 -3.617 µs -9.195 159.5
Local RMS Frequency Jitter 0.000 6.248 8.238 16.940 84.275 161.518 398.374 76.037 155.270 32.307 26.648 ppb 4.377 34.56
Local RMS Time Jitter 0.060 12.418 15.555 30.714 88.830 203.224 429.755 73.275 190.806 34.752 39.213 µs 5.608 43.61
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 3.401 5.864 32.918 149.844 197.622 3,732.841 143.980 194.221 77.470 54.588 µs 26.46 1249
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 0.000 2.915 4.642 23.786 165.638 210.716 603.596 160.996 207.801 55.395 48.864 µs 1.381 6.338
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.000 0.162 0.263 0.655 4.703 12.054 22.722 4.440 11.892 2.236 1.319 ms 3.676 26.45
Server Jitter 204.17.205.1 0.000 3.300 5.534 29.221 164.982 209.913 626.299 159.448 206.613 54.934 52.405 µs 1.63 7.879
Server Jitter 204.17.205.30 0.000 5.344 7.853 38.892 173.222 332.732 1,260.308 165.369 327.388 87.544 66.928 µs 5.715 62.62
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.000 0.195 0.268 0.709 3.186 9.416 105.669 2.918 9.221 5.642 1.514 ms 10.76 163
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.000 0.141 0.213 0.577 2.482 8.362 104.772 2.268 8.221 3.912 1.070 ms 19.72 502.4
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.071 0.162 0.225 0.466 1.130 2.589 4.893 0.906 2.428 0.482 0.565 ms 6.411 52.56
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.000 0.155 0.215 0.477 1.623 3.065 17.145 1.407 2.910 0.724 0.650 ms 10.77 218.9
Server Jitter SHM(0) 0.000 0.262 0.397 1.148 8.928 11.866 455.057 8.531 11.604 14.675 3.216 ms 18.63 467.5
Server Offset 2001:470:e815::24 (pi4.rellim.com) -465.111 -0.479 -0.114 0.006 0.094 0.231 25.055 0.209 0.710 7.390 -0.118 ms -66.78 4207
Server Offset 2001:470:e815::8 (spidey.rellim.com) -464.959 -0.891 -0.633 0.044 0.275 0.599 1.055 0.907 1.490 14.153 -0.458 ms -36.97 1218
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -465.029 -1.003 -0.763 -0.445 -0.044 0.768 3.770 0.719 1.771 11.073 -0.688 ms -46.26 1942
Server Offset 204.17.205.1 -465.485 -1.063 -0.769 -0.022 0.406 0.572 1.152 1.175 1.634 7.172 -0.173 ms -68.87 4472
Server Offset 204.17.205.30 -465.412 -0.337 -0.101 -0.012 0.086 0.282 1.689 0.187 0.619 10.874 -0.266 ms -46.89 2011
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -460.453 1.230 1.521 1.976 4.050 4.380 4.748 2.529 3.150 10.932 1.878 ms -45.17 1925
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -464.435 -1.023 -0.831 -0.413 0.111 0.311 0.943 0.942 1.335 10.852 -0.640 ms -47.04 2013
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -429.541 146.896 296.628 547.855 824.764 923.161 1,168.653 528.136 776.265 168.092 553.529 µs 18.43 61.47
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -1.373 -0.111 0.336 0.596 0.876 1.095 1.726 0.540 1.206 0.219 0.592 ms 8.191 32.92
Server Offset SHM(0) -591.431 -143.117 -139.648 -127.321 -121.413 -119.331 -117.052 18.235 23.786 10.460 -128.028 ms -2395 3.512e+04
TDOP 0.870 0.900 1.030 1.640 6.400 35.110 92.800 5.370 34.210 7.210 3.244 5.284 52.38
Temp /dev/sda 44.000 45.000 45.000 48.000 49.000 50.000 51.000 4.000 5.000 1.270 47.340 °C
Temp /dev/sdb 32.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.411 35.519 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 58.000 59.000 8.000 9.000 2.620 54.526 °C
Temp LM1 36.125 37.125 37.875 42.000 53.500 75.000 83.375 15.625 37.875 6.544 43.106 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.031 25.001 °C
Temp LM11 61.000 61.000 62.000 63.000 63.000 63.000 64.000 1.000 2.000 0.544 62.576 °C
Temp LM12 3.000 4.000 6.000 16.000 26.000 30.000 45.000 20.000 26.000 6.186 16.334 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.031 25.001 °C
Temp LM14 42.000 43.000 43.000 44.000 45.000 45.000 46.000 2.000 2.000 0.589 44.287 °C
Temp LM15 32.000 33.000 33.000 36.000 42.000 63.000 72.000 9.000 30.000 4.969 36.736 °C
Temp LM16 66.500 67.000 67.000 68.000 68.500 68.500 69.000 1.500 1.500 0.373 67.824 °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 36.250 37.250 38.000 42.500 52.000 73.750 83.500 14.000 36.500 6.094 43.367 °C
Temp LM20 36.125 37.125 37.875 42.000 53.250 75.000 83.375 15.375 37.875 6.535 43.095 °C
Temp LM21 66.500 67.000 67.250 68.000 68.500 68.750 69.125 1.250 1.750 0.344 67.960 °C
Temp LM22 33.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.379 35.587 °C
Temp LM23 63.850 64.850 66.850 69.850 70.850 71.850 72.850 4.000 7.000 1.372 69.784 °C
Temp LM3 44.000 45.000 45.000 48.000 49.000 50.000 52.000 4.000 5.000 1.267 47.332 °C
Temp LM4 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.798 50.829 °C
Temp LM5 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.783 50.844 °C
Temp LM6 55.850 56.850 57.850 58.850 61.850 69.850 74.850 4.000 13.000 2.014 59.463 °C
Temp LM7 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.775 50.847 °C
Temp LM8 42.000 43.000 43.000 44.000 45.000 45.000 46.000 2.000 2.000 0.588 44.286 °C
Temp LM9 32.000 33.000 33.500 36.500 40.500 50.500 51.500 7.000 17.500 2.780 36.420 °C
nSats 3.000 4.000 5.000 8.000 11.000 12.000 12.000 6.000 8.000 1.627 8.237 nSat 78.9 369.6
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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