NTPsec

Kong

Report generated: Fri Jun 14 03:49:00 2024 UTC
Start Time: Thu Jun 13 03:49:00 2024 UTC
End Time: Fri Jun 14 03:49:00 2024 UTC
Report Period: 1.0 days
Warning: plots clipped

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 -74.164 -55.611 -41.446 -2.108 35.864 51.721 64.214 77.310 107.332 23.081 -1.963 µs -4.608 11.74
Local Clock Frequency Offset 11.852 11.860 11.887 12.116 12.425 12.482 12.512 0.538 0.621 0.178 12.121 ppm 3.004e+05 2.013e+07

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 9.765 11.691 15.735 23.595 39.925 133.319 196.748 24.190 121.628 18.871 27.187 µs 7.028 51.19

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 5.024 6.076 7.266 12.336 23.659 72.819 105.966 16.393 66.743 10.574 14.391 ppb 6.346 44.3

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 -74.164 -55.611 -41.446 -2.108 35.864 51.721 64.214 77.310 107.332 23.081 -1.963 µs -4.608 11.74

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 11.852 11.860 11.887 12.116 12.425 12.482 12.512 0.538 0.621 0.178 12.121 ppm 3.004e+05 2.013e+07
Temp /dev/sda 47.000 47.000 48.000 49.000 50.000 51.000 51.000 2.000 4.000 0.881 49.260 °C
Temp /dev/sdb 36.000 36.000 37.000 38.000 40.000 40.000 40.000 3.000 4.000 1.043 38.097 °C
Temp LM0 47.000 49.000 49.000 53.000 58.000 59.000 59.000 9.000 10.000 2.672 53.472 °C
Temp LM1 45.125 45.125 45.750 47.875 52.750 63.625 67.000 7.000 18.500 2.816 48.511 °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 64.000 64.000 64.000 65.000 65.000 65.000 66.000 1.000 1.000 0.431 64.767 °C
Temp LM12 5.000 5.000 7.000 10.000 14.000 17.000 18.000 7.000 12.000 2.282 10.378 °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 46.000 46.000 46.000 47.000 47.000 48.000 48.000 1.000 2.000 0.504 46.628 °C
Temp LM15 38.000 38.000 39.000 40.000 43.000 52.000 56.000 4.000 14.000 1.824 40.472 °C
Temp LM16 69.000 69.000 69.000 70.000 70.500 70.500 70.500 1.500 1.500 0.374 69.800 °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 45.000 45.000 45.500 47.500 52.250 64.250 67.250 6.750 19.250 2.680 48.024 °C
Temp LM20 45.125 45.250 45.750 47.875 52.500 63.375 67.000 6.750 18.125 2.770 48.491 °C
Temp LM21 69.250 69.250 69.250 70.000 70.500 70.625 70.750 1.250 1.375 0.336 69.927 °C
Temp LM22 36.000 36.000 37.000 38.000 40.000 40.000 40.000 3.000 4.000 1.031 38.212 °C
Temp LM23 65.850 65.850 67.850 70.850 72.850 73.850 73.850 5.000 8.000 1.750 70.551 °C
Temp LM3 47.000 47.000 48.000 49.000 50.000 51.000 51.000 2.000 4.000 0.885 49.260 °C
Temp LM4 50.850 50.850 50.850 51.850 52.850 56.850 57.850 2.000 6.000 0.927 52.222 °C
Temp LM5 50.850 50.850 50.850 51.850 52.850 56.850 56.850 2.000 6.000 0.913 52.232 °C
Temp LM6 58.850 58.850 59.850 60.850 61.850 74.850 75.850 2.000 16.000 1.966 61.065 °C
Temp LM7 50.850 50.850 50.850 51.850 52.850 56.850 57.850 2.000 6.000 0.924 52.232 °C
Temp LM8 46.000 46.000 46.000 47.000 47.000 47.000 48.000 1.000 1.000 0.496 46.632 °C
Temp LM9 39.000 39.000 39.000 40.500 42.000 43.000 43.500 3.000 4.000 0.842 40.493 °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 7.000 9.000 10.000 12.000 14.000 15.000 17.000 4.000 6.000 1.299 11.585 nSat 520.7 4316
TDOP 0.800 0.900 0.980 1.480 2.560 3.380 6.050 1.580 2.480 0.514 1.584 16.96 66.17

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) -103.176 -74.128 -45.529 16.669 64.086 84.931 109.460 109.615 159.059 32.853 13.443 µs -2.36 6.497

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) -298.212 -277.801 -223.636 -35.857 283.111 841.206 969.525 506.747 1,119.007 181.118 -11.880 µs -1.504 9.87

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) -1.764 -1.522 -1.388 -1.036 -0.666 -0.459 -0.329 0.722 1.064 0.223 -1.040 ms -198.3 1221

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 -361.230 -346.317 -317.884 45.024 382.263 698.036 820.364 700.147 1,044.353 233.993 37.103 µs -2.754 6.355

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 -93.997 -72.252 -62.369 -27.798 13.443 42.243 90.117 75.812 114.495 22.758 -25.778 µs -15.39 47.13

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) 3.023 3.219 3.378 3.793 4.157 4.269 4.469 0.779 1.050 0.236 3.784 ms 3422 5.201e+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 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) -2.023 -1.986 -1.787 -1.348 -0.807 -0.459 -0.375 0.980 1.527 0.300 -1.344 ms -180.4 1075

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) -1.046 -1.046 77.661 370.355 694.678 938.331 938.331 617.017 939.377 207.516 370.945 µs 3.254 8.203

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) -75.420 -53.481 18.385 361.606 750.850 880.546 974.747 732.465 934.027 203.647 374.162 µs 3.292 8.279

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) -152.877 -139.601 -136.455 -131.726 -127.111 -125.411 -123.331 9.343 14.191 2.938 -131.814 ms -9.659e+04 4.436e+06

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) 2.054 3.443 4.997 14.062 55.625 78.065 95.102 50.628 74.622 15.917 19.323 µs 2.582 8.667

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) 2.409 2.740 3.431 8.054 25.317 35.637 40.250 21.886 32.897 6.905 10.369 µs 3.27 10.74

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) 0.155 0.197 0.253 0.671 6.043 15.647 19.654 5.789 15.450 2.394 1.540 ms 2.886 18.84

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 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 0.361 1.908 3.485 11.026 33.534 44.797 59.389 30.049 42.889 9.388 13.720 µs 2.861 8.979

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

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

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.30

peer jitter 204.17.205.30 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.30 1.145 2.283 3.765 13.032 39.888 51.856 68.352 36.123 49.573 11.093 16.091 µs 2.988 9.973

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) 0.138 0.153 0.227 0.586 4.877 8.298 20.528 4.650 8.145 1.896 1.260 ms 4.102 37.34

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) 0.100 0.170 0.240 0.517 2.207 4.443 13.751 1.967 4.273 1.059 0.799 ms 6.598 73.94

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) 0.232 0.232 0.252 0.532 1.411 1.594 1.594 1.158 1.362 0.352 0.615 ms 3.8 10.52

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) 0.153 0.155 0.177 0.418 2.144 2.919 26.053 1.968 2.764 1.880 0.721 ms 10.25 137.6

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 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) 0.150 0.256 0.384 0.966 2.498 6.337 18.833 2.114 6.080 1.090 1.196 ms 7.001 79.43

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 11.852 11.860 11.887 12.116 12.425 12.482 12.512 0.538 0.621 0.178 12.121 ppm 3.004e+05 2.013e+07
Local Clock Time Offset -74.164 -55.611 -41.446 -2.108 35.864 51.721 64.214 77.310 107.332 23.081 -1.963 µs -4.608 11.74
Local RMS Frequency Jitter 5.024 6.076 7.266 12.336 23.659 72.819 105.966 16.393 66.743 10.574 14.391 ppb 6.346 44.3
Local RMS Time Jitter 9.765 11.691 15.735 23.595 39.925 133.319 196.748 24.190 121.628 18.871 27.187 µs 7.028 51.19
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 2.054 3.443 4.997 14.062 55.625 78.065 95.102 50.628 74.622 15.917 19.323 µs 2.582 8.667
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 2.409 2.740 3.431 8.054 25.317 35.637 40.250 21.886 32.897 6.905 10.369 µs 3.27 10.74
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.155 0.197 0.253 0.671 6.043 15.647 19.654 5.789 15.450 2.394 1.540 ms 2.886 18.84
Server Jitter 204.17.205.1 0.361 1.908 3.485 11.026 33.534 44.797 59.389 30.049 42.889 9.388 13.720 µs 2.861 8.979
Server Jitter 204.17.205.30 1.145 2.283 3.765 13.032 39.888 51.856 68.352 36.123 49.573 11.093 16.091 µs 2.988 9.973
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.138 0.153 0.227 0.586 4.877 8.298 20.528 4.650 8.145 1.896 1.260 ms 4.102 37.34
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.100 0.170 0.240 0.517 2.207 4.443 13.751 1.967 4.273 1.059 0.799 ms 6.598 73.94
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.232 0.232 0.252 0.532 1.411 1.594 1.594 1.158 1.362 0.352 0.615 ms 3.8 10.52
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.153 0.155 0.177 0.418 2.144 2.919 26.053 1.968 2.764 1.880 0.721 ms 10.25 137.6
Server Jitter SHM(0) 0.150 0.256 0.384 0.966 2.498 6.337 18.833 2.114 6.080 1.090 1.196 ms 7.001 79.43
Server Offset 2001:470:e815::24 (pi4.rellim.com) -103.176 -74.128 -45.529 16.669 64.086 84.931 109.460 109.615 159.059 32.853 13.443 µs -2.36 6.497
Server Offset 2001:470:e815::8 (spidey.rellim.com) -298.212 -277.801 -223.636 -35.857 283.111 841.206 969.525 506.747 1,119.007 181.118 -11.880 µs -1.504 9.87
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -1.764 -1.522 -1.388 -1.036 -0.666 -0.459 -0.329 0.722 1.064 0.223 -1.040 ms -198.3 1221
Server Offset 204.17.205.1 -361.230 -346.317 -317.884 45.024 382.263 698.036 820.364 700.147 1,044.353 233.993 37.103 µs -2.754 6.355
Server Offset 204.17.205.30 -93.997 -72.252 -62.369 -27.798 13.443 42.243 90.117 75.812 114.495 22.758 -25.778 µs -15.39 47.13
Server Offset 2405:fc00::1 (robusta.dcs1.biz) 3.023 3.219 3.378 3.793 4.157 4.269 4.469 0.779 1.050 0.236 3.784 ms 3422 5.201e+04
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -2.023 -1.986 -1.787 -1.348 -0.807 -0.459 -0.375 0.980 1.527 0.300 -1.344 ms -180.4 1075
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.046 -1.046 77.661 370.355 694.678 938.331 938.331 617.017 939.377 207.516 370.945 µs 3.254 8.203
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -75.420 -53.481 18.385 361.606 750.850 880.546 974.747 732.465 934.027 203.647 374.162 µs 3.292 8.279
Server Offset SHM(0) -152.877 -139.601 -136.455 -131.726 -127.111 -125.411 -123.331 9.343 14.191 2.938 -131.814 ms -9.659e+04 4.436e+06
TDOP 0.800 0.900 0.980 1.480 2.560 3.380 6.050 1.580 2.480 0.514 1.584 16.96 66.17
Temp /dev/sda 47.000 47.000 48.000 49.000 50.000 51.000 51.000 2.000 4.000 0.881 49.260 °C
Temp /dev/sdb 36.000 36.000 37.000 38.000 40.000 40.000 40.000 3.000 4.000 1.043 38.097 °C
Temp LM0 47.000 49.000 49.000 53.000 58.000 59.000 59.000 9.000 10.000 2.672 53.472 °C
Temp LM1 45.125 45.125 45.750 47.875 52.750 63.625 67.000 7.000 18.500 2.816 48.511 °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 64.000 64.000 64.000 65.000 65.000 65.000 66.000 1.000 1.000 0.431 64.767 °C
Temp LM12 5.000 5.000 7.000 10.000 14.000 17.000 18.000 7.000 12.000 2.282 10.378 °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 46.000 46.000 46.000 47.000 47.000 48.000 48.000 1.000 2.000 0.504 46.628 °C
Temp LM15 38.000 38.000 39.000 40.000 43.000 52.000 56.000 4.000 14.000 1.824 40.472 °C
Temp LM16 69.000 69.000 69.000 70.000 70.500 70.500 70.500 1.500 1.500 0.374 69.800 °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 45.000 45.000 45.500 47.500 52.250 64.250 67.250 6.750 19.250 2.680 48.024 °C
Temp LM20 45.125 45.250 45.750 47.875 52.500 63.375 67.000 6.750 18.125 2.770 48.491 °C
Temp LM21 69.250 69.250 69.250 70.000 70.500 70.625 70.750 1.250 1.375 0.336 69.927 °C
Temp LM22 36.000 36.000 37.000 38.000 40.000 40.000 40.000 3.000 4.000 1.031 38.212 °C
Temp LM23 65.850 65.850 67.850 70.850 72.850 73.850 73.850 5.000 8.000 1.750 70.551 °C
Temp LM3 47.000 47.000 48.000 49.000 50.000 51.000 51.000 2.000 4.000 0.885 49.260 °C
Temp LM4 50.850 50.850 50.850 51.850 52.850 56.850 57.850 2.000 6.000 0.927 52.222 °C
Temp LM5 50.850 50.850 50.850 51.850 52.850 56.850 56.850 2.000 6.000 0.913 52.232 °C
Temp LM6 58.850 58.850 59.850 60.850 61.850 74.850 75.850 2.000 16.000 1.966 61.065 °C
Temp LM7 50.850 50.850 50.850 51.850 52.850 56.850 57.850 2.000 6.000 0.924 52.232 °C
Temp LM8 46.000 46.000 46.000 47.000 47.000 47.000 48.000 1.000 1.000 0.496 46.632 °C
Temp LM9 39.000 39.000 39.000 40.500 42.000 43.000 43.500 3.000 4.000 0.842 40.493 °C
nSats 7.000 9.000 10.000 12.000 14.000 15.000 17.000 4.000 6.000 1.299 11.585 nSat 520.7 4316
Summary as CSV file


This server:

Motherboard:
OS: Gentoo unstable
GPS/PPS server: gpsd
NTP server: NTPsec
../ntp.conf

Notes:

Feb 21 03:28:57 UTC 2019: New install

Glossary:

frequency offset:
The difference between the ntpd calculated frequency and the local system clock frequency (usually in parts per million, ppm)
jitter, dispersion:
The short term change in a value. NTP measures Local Time Jitter, Refclock Jitter, and Server Jitter in seconds. Local Frequency Jitter is in ppm or ppb.
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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