NTPsec

Kong

Report generated: Fri Jul 11 13:59:01 2025 UTC
Start Time: Fri Jul 4 13:59:00 2025 UTC
End Time: Fri Jul 11 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 -1.543 -0.153 -0.059 -0.001 0.055 0.148 58.424 0.114 0.301 1.176 0.031 ms 41.52 1840
Local Clock Frequency Offset 11.955 12.056 12.299 12.902 14.155 14.208 14.888 1.856 2.152 0.657 13.134 ppm 0.451 1.712

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 0.005 0.009 0.012 0.025 0.062 1.348 20.656 0.050 1.339 0.980 0.113 ms 15.42 265.5

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

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

RMS jitter is field 5 in the loopstats log file.



Local RMS Frequency Jitter

local stability plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local RMS Frequency Jitter 0.000 4.702 6.161 13.748 55.558 116.633 825.127 49.397 111.931 44.060 21.992 ppb 12.14 181.5

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 -1.543 -0.153 -0.059 -0.001 0.055 0.148 58.424 0.114 0.301 1.176 0.031 ms 41.52 1840

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 11.955 12.056 12.299 12.902 14.155 14.208 14.888 1.856 2.152 0.657 13.134 ppm 0.451 1.712
Temp /dev/nvme0n1 63.000 67.000 68.000 72.000 74.000 74.000 76.000 6.000 7.000 1.685 71.617 °C
Temp /dev/nvme1n1 44.000 51.000 51.000 53.000 55.000 58.000 59.000 4.000 7.000 1.320 52.954 °C
Temp /dev/sda 44.000 49.000 49.000 51.000 53.000 56.000 56.000 4.000 7.000 1.283 51.381 °C
Temp /dev/sdb 35.000 37.000 38.000 40.000 42.000 45.000 45.000 4.000 8.000 1.404 39.749 °C
Temp LM0 47.000 49.000 50.000 54.000 58.000 59.000 59.000 8.000 10.000 2.659 54.039 °C
Temp LM1 39.250 39.875 41.500 44.500 70.625 72.875 89.750 29.125 33.000 11.868 52.027 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.022 25.000 °C
Temp LM11 56.000 62.000 63.000 64.000 65.000 65.000 66.000 2.000 3.000 0.766 64.095 °C
Temp LM12 2.000 4.000 5.000 19.000 34.000 51.000 102.000 29.000 47.000 10.165 18.286 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.032 25.001 °C
Temp LM14 35.000 46.000 46.000 48.000 49.000 49.000 50.000 3.000 3.000 1.042 47.526 °C
Temp LM15 35.000 36.000 37.000 39.000 59.000 61.000 78.000 22.000 25.000 8.931 44.736 °C
Temp LM16 61.500 67.000 68.000 69.000 69.500 70.000 70.000 1.500 3.000 0.659 68.944 °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 39.000 40.000 41.750 45.250 70.500 72.750 88.250 28.750 32.750 11.105 51.865 °C
Temp LM20 39.250 39.875 41.500 44.500 70.625 72.750 89.750 29.125 32.875 11.860 52.019 °C
Temp LM21 61.875 67.250 68.000 69.250 69.875 70.000 70.250 1.875 2.750 0.654 69.081 °C
Temp LM22 34.000 38.000 38.000 40.000 42.000 45.000 45.000 4.000 7.000 1.360 39.906 °C
Temp LM23 62.850 66.850 67.850 71.850 73.850 73.850 75.850 6.000 7.000 1.688 71.472 °C
Temp LM3 44.000 49.000 49.000 51.000 53.000 56.000 56.000 4.000 7.000 1.282 51.384 °C
Temp LM4 43.850 50.850 50.850 52.850 54.850 57.850 58.850 4.000 7.000 1.316 52.795 °C
Temp LM5 43.850 50.850 50.850 52.850 54.850 57.850 58.850 4.000 7.000 1.313 52.804 °C
Temp LM6 53.850 57.850 58.850 60.850 64.850 74.850 77.850 6.000 17.000 2.522 61.208 °C
Temp LM7 43.850 50.850 50.850 52.850 54.850 57.850 58.850 4.000 7.000 1.318 52.818 °C
Temp LM8 35.000 46.000 46.000 48.000 49.000 49.000 50.000 3.000 3.000 1.039 47.531 °C
Temp LM9 35.000 36.000 37.000 39.500 49.500 50.000 60.500 12.500 14.000 4.431 41.809 °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 5.000 5.000 5.000 5.000 5.000 5.000 18.000 0.000 0.000 0.099 5.001 nSat 99.63 1.038e+04
TDOP 0.550 0.700 0.790 1.110 1.800 2.450 15.230 1.010 1.750 0.366 1.188 4.544 111.5

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) -1.938 -0.161 -0.075 0.005 0.071 0.202 81.801 0.146 0.364 2.410 0.100 ms 26.54 738.4

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) -1,724.777 -647.054 -153.053 30.512 165.264 383.496 2,263.401 318.317 1,030.550 155.729 24.044 µs 0.2146 43

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 -2.753 -1.884 -0.438 0.179 0.767 1.394 1.638 1.205 3.278 0.467 0.190 ms -1.606 11.87

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 204.17.205.30

peer offset 204.17.205.30 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.30 -1,274.182 -176.487 -85.854 -15.459 61.880 119.780 1,627.927 147.734 296.267 74.925 -14.177 µs 1.935 178.2

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) -157.066 -126.220 -94.403 -37.393 2.634 3.315 3.759 97.036 129.535 30.269 -31.411 ms -1.007 4.649

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) -22.166 -10.073 0.594 1.205 1.781 2.041 2.762 1.187 12.115 2.034 0.901 ms -7.204 62.49

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

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

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

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



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

peer offset 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 2606:4700:f1::1 (time.cloudflare.com) 1.970 2.095 2.232 2.491 3.452 3.598 4.416 1.219 1.503 0.413 2.648 ms 1.142 3.184

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) 1.882 2.192 2.299 2.756 3.565 3.650 4.492 1.266 1.458 0.476 2.913 ms 0.07568 1.429

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) -160.572 -141.253 -139.021 -133.170 -128.607 -126.885 -58.959 10.414 14.369 3.618 -133.338 ms 2.904 66.58

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

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

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

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



Server Jitters

peer jitters plot

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

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

RMS Jitter is field 8 in the peerstats log file.



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

peer jitter 2001:470:e815::24 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 0.004 0.005 0.032 0.175 0.222 51.321 0.170 0.218 1.654 0.134 ms 24.84 659.7

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 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 3.476 5.285 47.229 186.362 280.956 1,158.224 181.077 277.480 75.181 68.168 µs 5.167 60.26

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 3.429 5.663 28.476 205.715 256.219 891.639 200.052 252.790 72.185 65.785 µs 1.675 9.587

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 4.236 7.060 34.483 209.782 269.374 1,675.211 202.722 265.138 83.802 70.783 µs 5.265 78.6

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 0.166 0.252 1.029 44.181 73.989 115.602 43.929 73.822 16.446 9.618 ms 2.275 8.86

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 0.143 0.224 0.586 4.920 12.769 61.306 4.696 12.626 3.101 1.368 ms 11.35 193.5

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

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

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 2606:4700:f1::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 0.125 0.177 0.460 1.589 3.222 16.539 1.413 3.097 1.086 0.657 ms 10.42 136.7

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::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) 0.060 0.129 0.203 0.453 1.764 4.479 5.820 1.561 4.351 0.660 0.630 ms 4.431 27.34

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 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 0.290 0.421 1.051 2.742 6.660 34.070 2.322 6.370 1.260 1.312 ms 7.889 114

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 11.955 12.056 12.299 12.902 14.155 14.208 14.888 1.856 2.152 0.657 13.134 ppm 0.451 1.712
Local Clock Time Offset -1.543 -0.153 -0.059 -0.001 0.055 0.148 58.424 0.114 0.301 1.176 0.031 ms 41.52 1840
Local RMS Frequency Jitter 0.000 4.702 6.161 13.748 55.558 116.633 825.127 49.397 111.931 44.060 21.992 ppb 12.14 181.5
Local RMS Time Jitter 0.005 0.009 0.012 0.025 0.062 1.348 20.656 0.050 1.339 0.980 0.113 ms 15.42 265.5
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 0.004 0.005 0.032 0.175 0.222 51.321 0.170 0.218 1.654 0.134 ms 24.84 659.7
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 0.000 3.476 5.285 47.229 186.362 280.956 1,158.224 181.077 277.480 75.181 68.168 µs 5.167 60.26
Server Jitter 204.17.205.1 0.000 3.429 5.663 28.476 205.715 256.219 891.639 200.052 252.790 72.185 65.785 µs 1.675 9.587
Server Jitter 204.17.205.30 0.000 4.236 7.060 34.483 209.782 269.374 1,675.211 202.722 265.138 83.802 70.783 µs 5.265 78.6
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.000 0.166 0.252 1.029 44.181 73.989 115.602 43.929 73.822 16.446 9.618 ms 2.275 8.86
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.000 0.143 0.224 0.586 4.920 12.769 61.306 4.696 12.626 3.101 1.368 ms 11.35 193.5
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.000 0.125 0.177 0.460 1.589 3.222 16.539 1.413 3.097 1.086 0.657 ms 10.42 136.7
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.060 0.129 0.203 0.453 1.764 4.479 5.820 1.561 4.351 0.660 0.630 ms 4.431 27.34
Server Jitter SHM(0) 0.000 0.290 0.421 1.051 2.742 6.660 34.070 2.322 6.370 1.260 1.312 ms 7.889 114
Server Offset 2001:470:e815::24 (pi4.rellim.com) -1.938 -0.161 -0.075 0.005 0.071 0.202 81.801 0.146 0.364 2.410 0.100 ms 26.54 738.4
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1,724.777 -647.054 -153.053 30.512 165.264 383.496 2,263.401 318.317 1,030.550 155.729 24.044 µs 0.2146 43
Server Offset 204.17.205.1 -2.753 -1.884 -0.438 0.179 0.767 1.394 1.638 1.205 3.278 0.467 0.190 ms -1.606 11.87
Server Offset 204.17.205.30 -1,274.182 -176.487 -85.854 -15.459 61.880 119.780 1,627.927 147.734 296.267 74.925 -14.177 µs 1.935 178.2
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -157.066 -126.220 -94.403 -37.393 2.634 3.315 3.759 97.036 129.535 30.269 -31.411 ms -1.007 4.649
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -22.166 -10.073 0.594 1.205 1.781 2.041 2.762 1.187 12.115 2.034 0.901 ms -7.204 62.49
Server Offset 2606:4700:f1::1 (time.cloudflare.com) 1.970 2.095 2.232 2.491 3.452 3.598 4.416 1.219 1.503 0.413 2.648 ms 1.142 3.184
Server Offset 2606:4700:f1::123 (time.cloudflare.com) 1.882 2.192 2.299 2.756 3.565 3.650 4.492 1.266 1.458 0.476 2.913 ms 0.07568 1.429
Server Offset SHM(0) -160.572 -141.253 -139.021 -133.170 -128.607 -126.885 -58.959 10.414 14.369 3.618 -133.338 ms 2.904 66.58
TDOP 0.550 0.700 0.790 1.110 1.800 2.450 15.230 1.010 1.750 0.366 1.188 4.544 111.5
Temp /dev/nvme0n1 63.000 67.000 68.000 72.000 74.000 74.000 76.000 6.000 7.000 1.685 71.617 °C
Temp /dev/nvme1n1 44.000 51.000 51.000 53.000 55.000 58.000 59.000 4.000 7.000 1.320 52.954 °C
Temp /dev/sda 44.000 49.000 49.000 51.000 53.000 56.000 56.000 4.000 7.000 1.283 51.381 °C
Temp /dev/sdb 35.000 37.000 38.000 40.000 42.000 45.000 45.000 4.000 8.000 1.404 39.749 °C
Temp LM0 47.000 49.000 50.000 54.000 58.000 59.000 59.000 8.000 10.000 2.659 54.039 °C
Temp LM1 39.250 39.875 41.500 44.500 70.625 72.875 89.750 29.125 33.000 11.868 52.027 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.022 25.000 °C
Temp LM11 56.000 62.000 63.000 64.000 65.000 65.000 66.000 2.000 3.000 0.766 64.095 °C
Temp LM12 2.000 4.000 5.000 19.000 34.000 51.000 102.000 29.000 47.000 10.165 18.286 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.032 25.001 °C
Temp LM14 35.000 46.000 46.000 48.000 49.000 49.000 50.000 3.000 3.000 1.042 47.526 °C
Temp LM15 35.000 36.000 37.000 39.000 59.000 61.000 78.000 22.000 25.000 8.931 44.736 °C
Temp LM16 61.500 67.000 68.000 69.000 69.500 70.000 70.000 1.500 3.000 0.659 68.944 °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 39.000 40.000 41.750 45.250 70.500 72.750 88.250 28.750 32.750 11.105 51.865 °C
Temp LM20 39.250 39.875 41.500 44.500 70.625 72.750 89.750 29.125 32.875 11.860 52.019 °C
Temp LM21 61.875 67.250 68.000 69.250 69.875 70.000 70.250 1.875 2.750 0.654 69.081 °C
Temp LM22 34.000 38.000 38.000 40.000 42.000 45.000 45.000 4.000 7.000 1.360 39.906 °C
Temp LM23 62.850 66.850 67.850 71.850 73.850 73.850 75.850 6.000 7.000 1.688 71.472 °C
Temp LM3 44.000 49.000 49.000 51.000 53.000 56.000 56.000 4.000 7.000 1.282 51.384 °C
Temp LM4 43.850 50.850 50.850 52.850 54.850 57.850 58.850 4.000 7.000 1.316 52.795 °C
Temp LM5 43.850 50.850 50.850 52.850 54.850 57.850 58.850 4.000 7.000 1.313 52.804 °C
Temp LM6 53.850 57.850 58.850 60.850 64.850 74.850 77.850 6.000 17.000 2.522 61.208 °C
Temp LM7 43.850 50.850 50.850 52.850 54.850 57.850 58.850 4.000 7.000 1.318 52.818 °C
Temp LM8 35.000 46.000 46.000 48.000 49.000 49.000 50.000 3.000 3.000 1.039 47.531 °C
Temp LM9 35.000 36.000 37.000 39.500 49.500 50.000 60.500 12.500 14.000 4.431 41.809 °C
nSats 5.000 5.000 5.000 5.000 5.000 5.000 18.000 0.000 0.000 0.099 5.001 nSat 99.63 1.038e+04
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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