NTPsec

Kong

Report generated: Tue Jul 1 13:59:01 2025 UTC
Start Time: Tue Jun 24 13:59:00 2025 UTC
End Time: Tue Jul 1 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 -785.903 -187.131 -53.050 -1.138 55.004 186.166 2,722.236 108.054 373.297 91.002 1.340 µs 14.92 416.1
Local Clock Frequency Offset 12.100 12.202 12.246 12.525 13.099 13.564 14.393 0.853 1.362 0.287 12.591 ppm 1.647 6.975

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 6.784 8.777 11.505 22.210 56.780 142.535 695.371 45.275 133.758 46.296 29.447 µs 10.23 122.9

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 2.830 4.128 5.498 11.881 50.423 133.984 398.926 44.925 129.856 28.862 18.743 ppb 7.049 67.2

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 -785.903 -187.131 -53.050 -1.138 55.004 186.166 2,722.236 108.054 373.297 91.002 1.340 µs 14.92 416.1

The clock offsets of the local clock as a histogram.

The Local Clock Offset is field 3 from the loopstats log file.



Local Temperatures

local temps plot

Local temperatures. These will be site-specific depending upon what temperature sensors you collect data from. Temperature changes affect the local clock crystal frequency and stability. The math of how temperature changes frequency is complex, and also depends on crystal aging. So there is no easy way to correct for it in software. This is the single most important component of frequency drift.

The Local Temperatures are from field 3 from the tempstats log file.



Local Frequency/Temp

local freq temps plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset 12.100 12.202 12.246 12.525 13.099 13.564 14.393 0.853 1.362 0.287 12.591 ppm 1.647 6.975
Temp /dev/nvme0n1 64.000 66.000 69.000 72.000 73.000 74.000 76.000 4.000 8.000 1.500 71.528 °C
Temp /dev/nvme1n1 50.000 51.000 51.000 52.000 55.000 57.000 59.000 4.000 6.000 1.095 52.629 °C
Temp /dev/sda 48.000 48.000 49.000 51.000 53.000 53.000 53.000 4.000 5.000 1.089 50.656 °C
Temp /dev/sdb 37.000 37.000 37.000 39.000 42.000 43.000 43.000 5.000 6.000 1.311 38.912 °C
Temp LM0 48.000 49.000 50.000 54.000 58.000 58.000 59.000 8.000 9.000 2.724 54.020 °C
Temp LM1 41.125 43.000 43.250 44.500 54.375 69.000 87.250 11.125 26.000 5.323 46.319 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.055 25.003 °C
Temp LM11 63.000 63.000 63.000 64.000 65.000 66.000 66.000 2.000 3.000 0.655 64.019 °C
Temp LM12 3.000 5.000 10.000 19.000 22.000 24.000 36.000 12.000 19.000 3.508 18.471 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.050 25.002 °C
Temp LM14 45.000 46.000 46.000 47.000 48.000 49.000 49.000 2.000 3.000 0.765 46.721 °C
Temp LM15 37.000 37.000 38.000 39.000 44.000 58.000 76.000 6.000 21.000 3.843 39.872 °C
Temp LM16 68.500 68.500 68.500 69.000 70.500 70.500 71.000 2.000 2.000 0.538 69.174 °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 40.750 43.250 43.500 45.000 55.500 69.000 83.250 12.000 25.750 5.002 46.457 °C
Temp LM20 41.125 43.000 43.250 44.375 54.375 69.000 87.375 11.125 26.000 5.289 46.301 °C
Temp LM21 68.500 68.500 68.750 69.250 70.500 70.625 71.000 1.750 2.125 0.501 69.323 °C
Temp LM22 37.000 37.000 37.000 39.000 42.000 43.000 43.000 5.000 6.000 1.315 38.976 °C
Temp LM23 62.850 65.850 68.850 71.850 72.850 73.850 75.850 4.000 8.000 1.506 71.388 °C
Temp LM3 48.000 48.000 49.000 51.000 53.000 53.000 53.000 4.000 5.000 1.095 50.647 °C
Temp LM4 49.850 50.850 50.850 51.850 53.850 56.850 58.850 3.000 6.000 1.085 52.462 °C
Temp LM5 50.850 50.850 50.850 51.850 54.850 56.850 58.850 4.000 6.000 1.093 52.473 °C
Temp LM6 57.850 58.850 59.850 60.850 63.850 72.850 77.850 4.000 14.000 2.145 61.378 °C
Temp LM7 49.850 50.850 50.850 51.850 54.850 56.850 58.850 4.000 6.000 1.087 52.474 °C
Temp LM8 45.000 46.000 46.000 47.000 48.000 49.000 49.000 2.000 3.000 0.765 46.718 °C
Temp LM9 36.500 37.500 38.000 39.000 43.000 47.500 57.000 5.000 10.000 1.799 39.589 °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 6.000 9.000 10.000 13.000 16.000 17.000 19.000 6.000 8.000 1.711 13.112 nSat 0.1892 3.01
TDOP 0.530 0.740 0.830 1.160 2.000 2.750 6.950 1.170 2.010 0.397 1.262 2.068 11.26

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) -797.441 -188.373 -61.718 9.871 73.232 196.212 3,315.401 134.950 384.585 97.607 10.117 µs 16.45 528.7

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) -1,580.203 -666.707 -256.533 -13.355 183.813 532.527 1,956.396 440.346 1,199.234 196.886 -22.175 µs 0.1243 20.84

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 -2.614 -0.640 -0.410 -0.010 0.367 1.229 2.636 0.777 1.868 0.325 -0.018 ms -0.1152 17.86

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 -909.511 -190.225 -77.030 -15.288 41.716 202.364 2,710.055 118.746 392.589 93.446 -13.281 µs 13.71 411.2

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) 1.418 1.802 2.691 4.962 6.803 7.821 8.325 4.112 6.019 1.009 4.960 ms -0.4428 5.784

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) -32.022 -29.898 -23.330 1.112 1.655 2.051 3.462 24.985 31.950 7.424 -1.232 ms -2.942 10.12

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

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

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

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



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

peer offset 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2606:4700:f1::1 (time.cloudflare.com) 0.525 0.813 1.339 2.451 2.717 3.028 4.844 1.378 2.215 0.469 2.313 ms -1.527 6.294

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) 1.534 1.625 1.722 2.482 2.774 2.933 3.566 1.052 1.308 0.309 2.405 ms -0.9393 3.694

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) -171.177 -141.674 -139.335 -133.351 -128.893 -127.114 -123.220 10.441 14.560 3.205 -133.589 ms -0.6134 4.887

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

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

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

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



Server 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 2.723 4.331 13.111 68.022 141.851 1,626.193 63.691 139.128 45.507 22.943 µs 19.47 584

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 2.617 3.912 28.680 86.814 121.299 1,378.989 82.902 118.682 41.798 35.370 µs 11.5 298

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

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

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.1

peer jitter 204.17.205.1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.1 0.000 2.727 4.138 13.170 54.393 152.372 1,527.154 50.255 149.645 42.541 21.260 µs 18.18 520.9

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 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 3.415 5.302 17.462 96.854 200.486 2,278.815 91.552 197.071 77.083 31.951 µs 17.34 430.6

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 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 0.192 0.272 1.233 3.390 8.654 80.989 3.118 8.461 3.020 1.645 ms 16.92 391.3

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 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 0.136 0.222 0.564 5.116 10.326 78.902 4.894 10.190 2.899 1.317 ms 14.23 323.7

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

peer jitter 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.000 0.138 0.190 0.431 1.428 2.446 132.154 1.238 2.308 4.914 0.764 ms 23.9 590.6

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 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) 0.074 0.128 0.185 0.433 1.459 2.804 6.459 1.274 2.676 0.598 0.561 ms 6.394 57.74

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 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 0.277 0.407 1.010 2.619 4.933 34.738 2.212 4.655 1.037 1.237 ms 7.341 118.7

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.



Summary


Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset 12.100 12.202 12.246 12.525 13.099 13.564 14.393 0.853 1.362 0.287 12.591 ppm 1.647 6.975
Local Clock Time Offset -785.903 -187.131 -53.050 -1.138 55.004 186.166 2,722.236 108.054 373.297 91.002 1.340 µs 14.92 416.1
Local RMS Frequency Jitter 2.830 4.128 5.498 11.881 50.423 133.984 398.926 44.925 129.856 28.862 18.743 ppb 7.049 67.2
Local RMS Time Jitter 6.784 8.777 11.505 22.210 56.780 142.535 695.371 45.275 133.758 46.296 29.447 µs 10.23 122.9
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 2.723 4.331 13.111 68.022 141.851 1,626.193 63.691 139.128 45.507 22.943 µs 19.47 584
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 0.000 2.617 3.912 28.680 86.814 121.299 1,378.989 82.902 118.682 41.798 35.370 µs 11.5 298
Server Jitter 204.17.205.1 0.000 2.727 4.138 13.170 54.393 152.372 1,527.154 50.255 149.645 42.541 21.260 µs 18.18 520.9
Server Jitter 204.17.205.30 0.000 3.415 5.302 17.462 96.854 200.486 2,278.815 91.552 197.071 77.083 31.951 µs 17.34 430.6
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.000 0.192 0.272 1.233 3.390 8.654 80.989 3.118 8.461 3.020 1.645 ms 16.92 391.3
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.000 0.136 0.222 0.564 5.116 10.326 78.902 4.894 10.190 2.899 1.317 ms 14.23 323.7
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.000 0.138 0.190 0.431 1.428 2.446 132.154 1.238 2.308 4.914 0.764 ms 23.9 590.6
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.074 0.128 0.185 0.433 1.459 2.804 6.459 1.274 2.676 0.598 0.561 ms 6.394 57.74
Server Jitter SHM(0) 0.000 0.277 0.407 1.010 2.619 4.933 34.738 2.212 4.655 1.037 1.237 ms 7.341 118.7
Server Offset 2001:470:e815::24 (pi4.rellim.com) -797.441 -188.373 -61.718 9.871 73.232 196.212 3,315.401 134.950 384.585 97.607 10.117 µs 16.45 528.7
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1,580.203 -666.707 -256.533 -13.355 183.813 532.527 1,956.396 440.346 1,199.234 196.886 -22.175 µs 0.1243 20.84
Server Offset 204.17.205.1 -2.614 -0.640 -0.410 -0.010 0.367 1.229 2.636 0.777 1.868 0.325 -0.018 ms -0.1152 17.86
Server Offset 204.17.205.30 -909.511 -190.225 -77.030 -15.288 41.716 202.364 2,710.055 118.746 392.589 93.446 -13.281 µs 13.71 411.2
Server Offset 2405:fc00::1 (robusta.dcs1.biz) 1.418 1.802 2.691 4.962 6.803 7.821 8.325 4.112 6.019 1.009 4.960 ms -0.4428 5.784
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -32.022 -29.898 -23.330 1.112 1.655 2.051 3.462 24.985 31.950 7.424 -1.232 ms -2.942 10.12
Server Offset 2606:4700:f1::1 (time.cloudflare.com) 0.525 0.813 1.339 2.451 2.717 3.028 4.844 1.378 2.215 0.469 2.313 ms -1.527 6.294
Server Offset 2606:4700:f1::123 (time.cloudflare.com) 1.534 1.625 1.722 2.482 2.774 2.933 3.566 1.052 1.308 0.309 2.405 ms -0.9393 3.694
Server Offset SHM(0) -171.177 -141.674 -139.335 -133.351 -128.893 -127.114 -123.220 10.441 14.560 3.205 -133.589 ms -0.6134 4.887
TDOP 0.530 0.740 0.830 1.160 2.000 2.750 6.950 1.170 2.010 0.397 1.262 2.068 11.26
Temp /dev/nvme0n1 64.000 66.000 69.000 72.000 73.000 74.000 76.000 4.000 8.000 1.500 71.528 °C
Temp /dev/nvme1n1 50.000 51.000 51.000 52.000 55.000 57.000 59.000 4.000 6.000 1.095 52.629 °C
Temp /dev/sda 48.000 48.000 49.000 51.000 53.000 53.000 53.000 4.000 5.000 1.089 50.656 °C
Temp /dev/sdb 37.000 37.000 37.000 39.000 42.000 43.000 43.000 5.000 6.000 1.311 38.912 °C
Temp LM0 48.000 49.000 50.000 54.000 58.000 58.000 59.000 8.000 9.000 2.724 54.020 °C
Temp LM1 41.125 43.000 43.250 44.500 54.375 69.000 87.250 11.125 26.000 5.323 46.319 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.055 25.003 °C
Temp LM11 63.000 63.000 63.000 64.000 65.000 66.000 66.000 2.000 3.000 0.655 64.019 °C
Temp LM12 3.000 5.000 10.000 19.000 22.000 24.000 36.000 12.000 19.000 3.508 18.471 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.050 25.002 °C
Temp LM14 45.000 46.000 46.000 47.000 48.000 49.000 49.000 2.000 3.000 0.765 46.721 °C
Temp LM15 37.000 37.000 38.000 39.000 44.000 58.000 76.000 6.000 21.000 3.843 39.872 °C
Temp LM16 68.500 68.500 68.500 69.000 70.500 70.500 71.000 2.000 2.000 0.538 69.174 °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 40.750 43.250 43.500 45.000 55.500 69.000 83.250 12.000 25.750 5.002 46.457 °C
Temp LM20 41.125 43.000 43.250 44.375 54.375 69.000 87.375 11.125 26.000 5.289 46.301 °C
Temp LM21 68.500 68.500 68.750 69.250 70.500 70.625 71.000 1.750 2.125 0.501 69.323 °C
Temp LM22 37.000 37.000 37.000 39.000 42.000 43.000 43.000 5.000 6.000 1.315 38.976 °C
Temp LM23 62.850 65.850 68.850 71.850 72.850 73.850 75.850 4.000 8.000 1.506 71.388 °C
Temp LM3 48.000 48.000 49.000 51.000 53.000 53.000 53.000 4.000 5.000 1.095 50.647 °C
Temp LM4 49.850 50.850 50.850 51.850 53.850 56.850 58.850 3.000 6.000 1.085 52.462 °C
Temp LM5 50.850 50.850 50.850 51.850 54.850 56.850 58.850 4.000 6.000 1.093 52.473 °C
Temp LM6 57.850 58.850 59.850 60.850 63.850 72.850 77.850 4.000 14.000 2.145 61.378 °C
Temp LM7 49.850 50.850 50.850 51.850 54.850 56.850 58.850 4.000 6.000 1.087 52.474 °C
Temp LM8 45.000 46.000 46.000 47.000 48.000 49.000 49.000 2.000 3.000 0.765 46.718 °C
Temp LM9 36.500 37.500 38.000 39.000 43.000 47.500 57.000 5.000 10.000 1.799 39.589 °C
nSats 6.000 9.000 10.000 13.000 16.000 17.000 19.000 6.000 8.000 1.711 13.112 nSat 0.1892 3.01
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.
ms, millisecond:
One thousandth of a second = 0.001 seconds, 1e-3 seconds
mu, mean:
The arithmetic mean: the sum of all the values divided by the number of values. The formula for mu is: "mu = (∑xi) / N". Where xi denotes the data points and N is the number of data points.
ns, nanosecond:
One billionth of a second, also one thousandth of a microsecond, 0.000000001 seconds and 1e-9 seconds.
percentile:
The value below which a given percentage of values fall.
ppb, parts per billion:
Ratio between two values. These following are all the same: 1 ppb, one in one billion, 1/1,000,000,000, 0.000,000,001, 1e-9 and 0.000,000,1%
ppm, parts per million:
Ratio between two values. These following are all the same: 1 ppm, one in one million, 1/1,000,000, 0.000,001, and 0.000,1%
‰, parts per thousand:
Ratio between two values. These following are all the same: 1 ‰. one in one thousand, 1/1,000, 0.001, and 0.1%
refclock:
Reference clock, a local GPS module or other local source of time.
remote clock:
Any clock reached over the network, LAN or WAN. Also called a peer or server.
time offset:
The difference between the ntpd calculated time and the local system clock's time. Also called phase offset.
σ, sigma:
Sigma denotes the standard deviation (SD) and is centered on the arithmetic mean of the data set. The SD is simply the square root of the variance of the data set. Two sigma is simply twice the standard deviation. Three sigma is three times sigma. Smaller is better.
The formula for sigma is: "σ = √[ ∑(xi-mu)^2 / N ]". Where xi denotes the data points and N is the number of data points.
Skewness, Skew:
The skewness of a random variable X is the third standardized moment and is a dimension-less ratio. ntpviz uses the FIsher-Pearson moment of skewness. There are other different ways to calculate Skewness Wikipedia describes Skewness best: "The qualitative interpretation of the skew is complicated and unintuitive."
A normal distribution has a skewness of zero.
Kurtosis, Kurt:
The kurtosis of a random variable X is the fourth standardized moment and is a dimension-less ratio. ntpviz uses standard Kurtosis. There are other different ways to calculate Kurtosis.
A normal distribution has a Kurtosis of three. NIST describes a kurtosis over three as "heavy tailed" and one under three as "light tailed".
upstream clock:
Any server or reference clock used as a source of time.
µs, us, microsecond:
One millionth of a second, also one thousandth of a millisecond, 0.000,001 seconds, and 1e-6 seconds.



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