NTPsec

Kong

Report generated: Wed Jul 24 11:49:00 2024 UTC
Start Time: Tue Jul 23 11:49:00 2024 UTC
End Time: Wed Jul 24 11:49:00 2024 UTC
Report Period: 1.0 days
Warning: plots clipped

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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 -256.363 -84.619 -37.802 -1.835 35.790 147.658 341.935 73.592 232.277 39.398 -0.328 µs -1.885 32.46
Local Clock Frequency Offset 12.048 12.086 12.115 12.846 13.209 13.906 13.931 1.094 1.820 0.401 12.747 ppm 2.93e+04 9.052e+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 8.136 9.427 10.900 18.487 39.974 59.479 65.654 29.074 50.052 9.541 20.371 µs 7.263 30.06

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 3.654 4.615 5.729 10.542 58.599 120.234 155.248 52.870 115.619 21.246 16.138 ppb 3.47 17.71

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 -256.363 -84.619 -37.802 -1.835 35.790 147.658 341.935 73.592 232.277 39.398 -0.328 µs -1.885 32.46

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 12.048 12.086 12.115 12.846 13.209 13.906 13.931 1.094 1.820 0.401 12.747 ppm 2.93e+04 9.052e+05
Temp /dev/sda 49.000 49.000 49.000 52.000 53.000 53.000 53.000 4.000 4.000 1.431 51.505 °C
Temp /dev/sdb 37.000 38.000 38.000 41.000 43.000 44.000 44.000 5.000 6.000 1.678 40.732 °C
Temp LM0 49.000 49.000 49.000 53.000 58.000 59.000 59.000 9.000 10.000 2.615 53.366 °C
Temp LM1 44.250 44.500 45.000 49.250 55.625 76.750 77.625 10.625 32.250 5.099 49.618 °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 63.000 63.000 63.000 65.000 66.000 66.000 67.000 3.000 3.000 1.037 64.976 °C
Temp LM12 4.000 4.000 5.000 9.000 13.000 15.000 16.000 8.000 11.000 2.527 8.923 °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 45.000 45.000 46.000 48.000 49.000 50.000 50.000 3.000 5.000 1.263 47.645 °C
Temp LM15 38.000 38.000 38.000 42.000 45.000 65.000 67.000 7.000 27.000 4.157 42.045 °C
Temp LM16 68.000 68.500 68.500 70.000 71.000 71.500 71.500 2.500 3.000 0.880 69.882 °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 44.000 44.000 44.750 49.250 54.250 75.250 78.500 9.500 31.250 4.655 49.686 °C
Temp LM20 44.000 44.375 45.125 49.250 55.250 76.750 77.750 10.125 32.375 5.073 49.591 °C
Temp LM21 68.250 68.500 68.625 70.250 71.125 71.500 71.750 2.500 3.000 0.869 70.035 °C
Temp LM22 38.000 38.000 38.000 41.000 43.000 44.000 44.000 5.000 6.000 1.646 40.735 °C
Temp LM23 65.850 66.850 67.850 71.850 74.850 75.850 75.850 7.000 9.000 2.126 71.435 °C
Temp LM3 48.000 49.000 49.000 52.000 53.000 53.000 53.000 4.000 4.000 1.424 51.512 °C
Temp LM4 50.850 50.850 50.850 53.850 54.850 56.850 56.850 4.000 6.000 1.293 53.362 °C
Temp LM5 50.850 50.850 50.850 53.850 54.850 56.850 56.850 4.000 6.000 1.306 53.394 °C
Temp LM6 57.850 58.850 60.850 62.850 65.850 71.850 74.850 5.000 13.000 2.030 63.031 °C
Temp LM7 50.850 50.850 50.850 53.850 54.850 56.850 56.850 4.000 6.000 1.289 53.394 °C
Temp LM8 45.000 45.000 46.000 48.000 49.000 50.000 50.000 3.000 5.000 1.263 47.645 °C
Temp LM9 38.000 38.000 38.500 42.000 45.000 54.000 54.000 6.500 16.000 2.498 41.889 °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 13.000 14.000 15.000 3.000 5.000 1.186 11.534 nSat 689.9 6248
TDOP 0.850 0.910 1.010 1.460 2.650 3.440 8.130 1.640 2.530 0.522 1.583 16.5 68.14

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) -218.928 -98.320 -41.288 17.250 63.444 181.258 443.358 104.732 279.578 47.963 17.805 µs 0.8423 27.07

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) -1.838 -1.768 -1.496 -0.010 1.255 1.406 1.497 2.750 3.174 0.773 -0.124 ms -5.128 12.96

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 -595.875 -415.747 -354.282 7.758 290.421 330.069 361.093 644.703 745.816 180.291 5.044 µs -4.301 11.41

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 204.17.205.16

peer offset 204.17.205.16 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Offset 204.17.205.16 -244.123 -117.224 -40.705 8.303 59.612 125.200 226.044 100.317 242.424 40.121 8.909 µs -3.379 19.02

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 -341.623 -143.960 -65.757 -27.264 24.715 113.554 277.770 90.472 257.514 43.806 -24.828 µs -8.414 44.01

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) 4.346 4.885 5.149 5.997 6.719 7.071 7.125 1.570 2.186 0.487 5.947 ms 1442 1.654e+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) -0.048 0.024 0.557 1.645 2.560 2.934 3.289 2.004 2.910 0.578 1.627 ms 11.15 31.94

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) 1.336 1.563 1.744 2.175 2.647 2.859 2.929 0.904 1.296 0.255 2.194 ms 464.1 3712

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) -162.350 -138.635 -136.009 -131.512 -126.908 -125.177 -122.910 9.101 13.459 2.815 -131.486 ms -1.087e+05 5.191e+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) 2.039 3.182 4.303 13.110 57.991 130.132 2,358.584 53.688 126.950 161.515 33.300 µs 9.353 127.7

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) 1.556 2.454 3.571 15.030 74.255 120.948 162.508 70.684 118.494 25.964 24.870 µs 1.919 7.715

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

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

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 204.17.205.1

peer jitter 204.17.205.1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.1 1.602 2.529 3.623 10.857 36.066 93.779 3,608.687 32.443 91.250 146.879 20.839 µs 20.93 511.6

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 204.17.205.16

peer jitter 204.17.205.16 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 204.17.205.16 2.698 4.111 5.670 14.207 45.712 252.135 3,856.143 40.042 248.024 245.568 36.834 µs 11.23 168.6

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 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 1.134 2.242 3.630 10.951 38.601 86.893 128.054 34.971 84.651 15.972 16.462 µs 3.26 17.36

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) 0.177 0.215 0.410 1.863 5.495 8.319 8.498 5.085 8.104 1.661 2.379 ms 2.726 8.689

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) 0.193 0.267 0.337 1.028 2.433 7.976 8.689 2.096 7.708 1.127 1.245 ms 4.393 25.97

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) 0.069 0.186 0.254 0.554 1.581 92.794 93.078 1.326 92.607 9.555 1.695 ms 6.369 63.3

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 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) 0.130 0.303 0.426 1.010 2.516 3.900 27.386 2.090 3.597 1.081 1.226 ms 9.024 138.9

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.



Summary


Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Local Clock Frequency Offset 12.048 12.086 12.115 12.846 13.209 13.906 13.931 1.094 1.820 0.401 12.747 ppm 2.93e+04 9.052e+05
Local Clock Time Offset -256.363 -84.619 -37.802 -1.835 35.790 147.658 341.935 73.592 232.277 39.398 -0.328 µs -1.885 32.46
Local RMS Frequency Jitter 3.654 4.615 5.729 10.542 58.599 120.234 155.248 52.870 115.619 21.246 16.138 ppb 3.47 17.71
Local RMS Time Jitter 8.136 9.427 10.900 18.487 39.974 59.479 65.654 29.074 50.052 9.541 20.371 µs 7.263 30.06
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 2.039 3.182 4.303 13.110 57.991 130.132 2,358.584 53.688 126.950 161.515 33.300 µs 9.353 127.7
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 1.556 2.454 3.571 15.030 74.255 120.948 162.508 70.684 118.494 25.964 24.870 µs 1.919 7.715
Server Jitter 204.17.205.1 1.602 2.529 3.623 10.857 36.066 93.779 3,608.687 32.443 91.250 146.879 20.839 µs 20.93 511.6
Server Jitter 204.17.205.16 2.698 4.111 5.670 14.207 45.712 252.135 3,856.143 40.042 248.024 245.568 36.834 µs 11.23 168.6
Server Jitter 204.17.205.30 1.134 2.242 3.630 10.951 38.601 86.893 128.054 34.971 84.651 15.972 16.462 µs 3.26 17.36
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.177 0.215 0.410 1.863 5.495 8.319 8.498 5.085 8.104 1.661 2.379 ms 2.726 8.689
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.193 0.267 0.337 1.028 2.433 7.976 8.689 2.096 7.708 1.127 1.245 ms 4.393 25.97
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.069 0.186 0.254 0.554 1.581 92.794 93.078 1.326 92.607 9.555 1.695 ms 6.369 63.3
Server Jitter SHM(0) 0.130 0.303 0.426 1.010 2.516 3.900 27.386 2.090 3.597 1.081 1.226 ms 9.024 138.9
Server Offset 2001:470:e815::24 (pi4.rellim.com) -218.928 -98.320 -41.288 17.250 63.444 181.258 443.358 104.732 279.578 47.963 17.805 µs 0.8423 27.07
Server Offset 2001:470:e815::8 (spidey.rellim.com) -1.838 -1.768 -1.496 -0.010 1.255 1.406 1.497 2.750 3.174 0.773 -0.124 ms -5.128 12.96
Server Offset 204.17.205.1 -595.875 -415.747 -354.282 7.758 290.421 330.069 361.093 644.703 745.816 180.291 5.044 µs -4.301 11.41
Server Offset 204.17.205.16 -244.123 -117.224 -40.705 8.303 59.612 125.200 226.044 100.317 242.424 40.121 8.909 µs -3.379 19.02
Server Offset 204.17.205.30 -341.623 -143.960 -65.757 -27.264 24.715 113.554 277.770 90.472 257.514 43.806 -24.828 µs -8.414 44.01
Server Offset 2405:fc00::1 (robusta.dcs1.biz) 4.346 4.885 5.149 5.997 6.719 7.071 7.125 1.570 2.186 0.487 5.947 ms 1442 1.654e+04
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -0.048 0.024 0.557 1.645 2.560 2.934 3.289 2.004 2.910 0.578 1.627 ms 11.15 31.94
Server Offset 2606:4700:f1::123 (time.cloudflare.com) 1.336 1.563 1.744 2.175 2.647 2.859 2.929 0.904 1.296 0.255 2.194 ms 464.1 3712
Server Offset SHM(0) -162.350 -138.635 -136.009 -131.512 -126.908 -125.177 -122.910 9.101 13.459 2.815 -131.486 ms -1.087e+05 5.191e+06
TDOP 0.850 0.910 1.010 1.460 2.650 3.440 8.130 1.640 2.530 0.522 1.583 16.5 68.14
Temp /dev/sda 49.000 49.000 49.000 52.000 53.000 53.000 53.000 4.000 4.000 1.431 51.505 °C
Temp /dev/sdb 37.000 38.000 38.000 41.000 43.000 44.000 44.000 5.000 6.000 1.678 40.732 °C
Temp LM0 49.000 49.000 49.000 53.000 58.000 59.000 59.000 9.000 10.000 2.615 53.366 °C
Temp LM1 44.250 44.500 45.000 49.250 55.625 76.750 77.625 10.625 32.250 5.099 49.618 °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 63.000 63.000 63.000 65.000 66.000 66.000 67.000 3.000 3.000 1.037 64.976 °C
Temp LM12 4.000 4.000 5.000 9.000 13.000 15.000 16.000 8.000 11.000 2.527 8.923 °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 45.000 45.000 46.000 48.000 49.000 50.000 50.000 3.000 5.000 1.263 47.645 °C
Temp LM15 38.000 38.000 38.000 42.000 45.000 65.000 67.000 7.000 27.000 4.157 42.045 °C
Temp LM16 68.000 68.500 68.500 70.000 71.000 71.500 71.500 2.500 3.000 0.880 69.882 °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 44.000 44.000 44.750 49.250 54.250 75.250 78.500 9.500 31.250 4.655 49.686 °C
Temp LM20 44.000 44.375 45.125 49.250 55.250 76.750 77.750 10.125 32.375 5.073 49.591 °C
Temp LM21 68.250 68.500 68.625 70.250 71.125 71.500 71.750 2.500 3.000 0.869 70.035 °C
Temp LM22 38.000 38.000 38.000 41.000 43.000 44.000 44.000 5.000 6.000 1.646 40.735 °C
Temp LM23 65.850 66.850 67.850 71.850 74.850 75.850 75.850 7.000 9.000 2.126 71.435 °C
Temp LM3 48.000 49.000 49.000 52.000 53.000 53.000 53.000 4.000 4.000 1.424 51.512 °C
Temp LM4 50.850 50.850 50.850 53.850 54.850 56.850 56.850 4.000 6.000 1.293 53.362 °C
Temp LM5 50.850 50.850 50.850 53.850 54.850 56.850 56.850 4.000 6.000 1.306 53.394 °C
Temp LM6 57.850 58.850 60.850 62.850 65.850 71.850 74.850 5.000 13.000 2.030 63.031 °C
Temp LM7 50.850 50.850 50.850 53.850 54.850 56.850 56.850 4.000 6.000 1.289 53.394 °C
Temp LM8 45.000 45.000 46.000 48.000 49.000 50.000 50.000 3.000 5.000 1.263 47.645 °C
Temp LM9 38.000 38.000 38.500 42.000 45.000 54.000 54.000 6.500 16.000 2.498 41.889 °C
nSats 7.000 9.000 10.000 12.000 13.000 14.000 15.000 3.000 5.000 1.186 11.534 nSat 689.9 6248
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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