NTPsec

Kong

Report generated: Fri May 24 13:59:01 2024 UTC
Start Time: Fri May 17 13:59:00 2024 UTC
End Time: Fri May 24 13:59:00 2024 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 -373.416 -159.054 -52.549 -3.107 47.871 190.097 415.800 100.420 349.151 47.105 -2.043 µs -3.294 23.78
Local Clock Frequency Offset 11.402 11.455 11.618 12.025 12.738 13.437 13.549 1.120 1.982 0.348 12.072 ppm 3.844e+04 1.3e+06

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 0.119 10.527 12.983 22.541 49.638 79.866 133.376 36.655 69.339 12.821 25.502 µs 6.764 33

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 4.489 5.698 11.813 62.404 104.866 150.416 56.706 100.377 19.143 18.159 ppb 2.982 13.22

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 -373.416 -159.054 -52.549 -3.107 47.871 190.097 415.800 100.420 349.151 47.105 -2.043 µs -3.294 23.78

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 11.402 11.455 11.618 12.025 12.738 13.437 13.549 1.120 1.982 0.348 12.072 ppm 3.844e+04 1.3e+06
Temp /dev/sda 44.000 45.000 45.000 48.000 50.000 51.000 52.000 5.000 6.000 1.340 47.876 °C
Temp /dev/sdb 34.000 34.000 35.000 37.000 40.000 41.000 41.000 5.000 7.000 1.294 37.278 °C
Temp LM0 48.000 49.000 49.000 54.000 58.000 59.000 59.000 9.000 10.000 2.858 53.759 °C
Temp LM1 42.500 43.000 43.500 46.250 69.875 76.375 83.625 26.375 33.375 7.390 49.145 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.067 25.004 °C
Temp LM11 62.000 62.000 63.000 64.000 65.000 65.000 65.000 2.000 3.000 0.652 63.629 °C
Temp LM12 3.000 4.000 5.000 10.000 15.000 17.000 23.000 10.000 13.000 2.937 9.869 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.031 25.001 °C
Temp LM14 43.000 43.000 44.000 45.000 46.000 46.000 47.000 2.000 3.000 0.762 45.129 °C
Temp LM15 36.000 37.000 37.000 39.000 58.000 65.000 72.000 21.000 28.000 5.907 40.922 °C
Temp LM16 67.500 67.500 68.000 69.000 69.500 70.000 70.500 1.500 2.500 0.495 68.860 °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 42.000 43.250 43.750 46.750 68.000 75.250 83.250 24.250 32.000 6.989 48.809 °C
Temp LM20 42.500 43.000 43.500 46.250 69.875 76.375 83.625 26.375 33.375 7.368 49.094 °C
Temp LM21 67.750 67.750 68.000 69.000 69.750 70.000 70.875 1.750 2.250 0.483 69.002 °C
Temp LM22 34.000 34.000 35.000 37.000 40.000 41.000 41.000 5.000 7.000 1.275 37.350 °C
Temp LM23 63.850 64.850 65.850 69.850 70.850 71.850 71.850 5.000 7.000 1.696 69.041 °C
Temp LM3 45.000 45.000 45.000 48.000 50.000 51.000 52.000 5.000 6.000 1.351 47.890 °C
Temp LM4 47.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.857 50.936 °C
Temp LM5 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.870 50.946 °C
Temp LM6 55.850 56.850 57.850 58.850 61.850 68.850 74.850 4.000 12.000 1.836 59.519 °C
Temp LM7 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.849 50.945 °C
Temp LM8 43.000 43.000 44.000 45.000 46.000 46.000 47.000 2.000 3.000 0.766 45.130 °C
Temp LM9 36.500 37.000 37.500 39.500 46.500 52.000 53.000 9.000 15.000 2.707 40.002 °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 8.000 9.000 11.000 14.000 15.000 17.000 5.000 7.000 1.439 11.177 nSat 330.5 2383
TDOP 0.740 0.900 1.020 1.500 2.550 3.380 16.240 1.530 2.480 0.535 1.606 17.09 103.4

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) -152.853 -0.131 -0.053 0.015 0.078 0.235 0.456 0.130 0.366 2.393 -0.021 ms -67.87 4340

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) -153.059 -0.233 -0.168 -0.010 0.084 0.252 1.212 0.253 0.485 4.670 -0.158 ms -36.91 1213

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) -3.291 -1.999 -1.667 -0.661 -0.068 0.220 3.757 1.600 2.219 0.541 -0.765 ms -21.29 74.2

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 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 -152.985 -0.613 -0.429 0.019 0.231 0.304 0.461 0.659 0.917 2.378 -0.052 ms -67.99 4375

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 -153.035 -0.183 -0.078 -0.029 0.024 0.180 0.520 0.102 0.363 3.361 -0.101 ms -49.65 2264

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) -153.838 -1.319 -1.109 -0.455 0.515 1.022 3.020 1.623 2.341 3.500 -0.464 ms -47.68 2080

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) -155.011 -2.165 -1.933 -1.502 -0.969 -0.569 1.501 0.964 1.596 3.469 -1.560 ms -51.23 2211

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) -440.460 -98.397 20.489 377.612 776.904 958.225 2,870.824 756.415 1,056.622 238.806 390.429 µs 3.051 14.49

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 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) -289.596 -138.260 -135.679 -131.200 -126.646 -124.683 -119.921 9.033 13.577 2.999 -131.221 ms -8.978e+04 4.025e+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) 0.000 3.476 5.292 15.610 63.225 105.126 236.853 57.933 101.650 20.870 22.208 µs 3.191 18.04

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 2.243 3.196 8.572 36.407 97.700 1,362.730 33.211 95.457 27.708 13.677 µs 28.46 1302

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

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

RMS Jitter is field 8 in the peerstats log file.



Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net)

peer jitter 2001:67c:1270:0:dea6:32ff:feaf:803b plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.000 0.185 0.247 0.590 3.752 8.673 38.804 3.505 8.488 2.035 1.124 ms 7.694 120.7

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 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 2.250 3.686 12.177 40.647 88.685 183.543 36.961 86.435 15.730 16.193 µs 4.266 30.23

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 2.184 3.578 13.667 66.644 192.423 712.960 63.066 190.239 37.466 22.753 µs 6.794 92.1

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 0.182 0.260 0.627 3.487 10.127 82.734 3.227 9.944 3.651 1.239 ms 15.56 339.7

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 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 0.173 0.242 0.561 1.657 3.182 6.709 1.415 3.009 0.575 0.724 ms 4.401 29.02

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 0.163 0.214 0.428 1.265 2.496 10.994 1.051 2.333 0.523 0.551 ms 7.894 110.6

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) 0.000 0.279 0.408 0.991 2.559 6.431 146.096 2.150 6.152 1.711 1.247 ms 35.65 2296

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 11.402 11.455 11.618 12.025 12.738 13.437 13.549 1.120 1.982 0.348 12.072 ppm 3.844e+04 1.3e+06
Local Clock Time Offset -373.416 -159.054 -52.549 -3.107 47.871 190.097 415.800 100.420 349.151 47.105 -2.043 µs -3.294 23.78
Local RMS Frequency Jitter 0.000 4.489 5.698 11.813 62.404 104.866 150.416 56.706 100.377 19.143 18.159 ppb 2.982 13.22
Local RMS Time Jitter 0.119 10.527 12.983 22.541 49.638 79.866 133.376 36.655 69.339 12.821 25.502 µs 6.764 33
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 3.476 5.292 15.610 63.225 105.126 236.853 57.933 101.650 20.870 22.208 µs 3.191 18.04
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 0.000 2.243 3.196 8.572 36.407 97.700 1,362.730 33.211 95.457 27.708 13.677 µs 28.46 1302
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.000 0.185 0.247 0.590 3.752 8.673 38.804 3.505 8.488 2.035 1.124 ms 7.694 120.7
Server Jitter 204.17.205.1 0.000 2.250 3.686 12.177 40.647 88.685 183.543 36.961 86.435 15.730 16.193 µs 4.266 30.23
Server Jitter 204.17.205.30 0.000 2.184 3.578 13.667 66.644 192.423 712.960 63.066 190.239 37.466 22.753 µs 6.794 92.1
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.000 0.182 0.260 0.627 3.487 10.127 82.734 3.227 9.944 3.651 1.239 ms 15.56 339.7
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.000 0.173 0.242 0.561 1.657 3.182 6.709 1.415 3.009 0.575 0.724 ms 4.401 29.02
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.000 0.163 0.214 0.428 1.265 2.496 10.994 1.051 2.333 0.523 0.551 ms 7.894 110.6
Server Jitter SHM(0) 0.000 0.279 0.408 0.991 2.559 6.431 146.096 2.150 6.152 1.711 1.247 ms 35.65 2296
Server Offset 2001:470:e815::24 (pi4.rellim.com) -152.853 -0.131 -0.053 0.015 0.078 0.235 0.456 0.130 0.366 2.393 -0.021 ms -67.87 4340
Server Offset 2001:470:e815::8 (spidey.rellim.com) -153.059 -0.233 -0.168 -0.010 0.084 0.252 1.212 0.253 0.485 4.670 -0.158 ms -36.91 1213
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -3.291 -1.999 -1.667 -0.661 -0.068 0.220 3.757 1.600 2.219 0.541 -0.765 ms -21.29 74.2
Server Offset 204.17.205.1 -152.985 -0.613 -0.429 0.019 0.231 0.304 0.461 0.659 0.917 2.378 -0.052 ms -67.99 4375
Server Offset 204.17.205.30 -153.035 -0.183 -0.078 -0.029 0.024 0.180 0.520 0.102 0.363 3.361 -0.101 ms -49.65 2264
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -153.838 -1.319 -1.109 -0.455 0.515 1.022 3.020 1.623 2.341 3.500 -0.464 ms -47.68 2080
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -155.011 -2.165 -1.933 -1.502 -0.969 -0.569 1.501 0.964 1.596 3.469 -1.560 ms -51.23 2211
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -440.460 -98.397 20.489 377.612 776.904 958.225 2,870.824 756.415 1,056.622 238.806 390.429 µs 3.051 14.49
Server Offset SHM(0) -289.596 -138.260 -135.679 -131.200 -126.646 -124.683 -119.921 9.033 13.577 2.999 -131.221 ms -8.978e+04 4.025e+06
TDOP 0.740 0.900 1.020 1.500 2.550 3.380 16.240 1.530 2.480 0.535 1.606 17.09 103.4
Temp /dev/sda 44.000 45.000 45.000 48.000 50.000 51.000 52.000 5.000 6.000 1.340 47.876 °C
Temp /dev/sdb 34.000 34.000 35.000 37.000 40.000 41.000 41.000 5.000 7.000 1.294 37.278 °C
Temp LM0 48.000 49.000 49.000 54.000 58.000 59.000 59.000 9.000 10.000 2.858 53.759 °C
Temp LM1 42.500 43.000 43.500 46.250 69.875 76.375 83.625 26.375 33.375 7.390 49.145 °C
Temp LM10 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.067 25.004 °C
Temp LM11 62.000 62.000 63.000 64.000 65.000 65.000 65.000 2.000 3.000 0.652 63.629 °C
Temp LM12 3.000 4.000 5.000 10.000 15.000 17.000 23.000 10.000 13.000 2.937 9.869 °C
Temp LM13 25.000 25.000 25.000 25.000 25.000 25.000 26.000 0.000 0.000 0.031 25.001 °C
Temp LM14 43.000 43.000 44.000 45.000 46.000 46.000 47.000 2.000 3.000 0.762 45.129 °C
Temp LM15 36.000 37.000 37.000 39.000 58.000 65.000 72.000 21.000 28.000 5.907 40.922 °C
Temp LM16 67.500 67.500 68.000 69.000 69.500 70.000 70.500 1.500 2.500 0.495 68.860 °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 42.000 43.250 43.750 46.750 68.000 75.250 83.250 24.250 32.000 6.989 48.809 °C
Temp LM20 42.500 43.000 43.500 46.250 69.875 76.375 83.625 26.375 33.375 7.368 49.094 °C
Temp LM21 67.750 67.750 68.000 69.000 69.750 70.000 70.875 1.750 2.250 0.483 69.002 °C
Temp LM22 34.000 34.000 35.000 37.000 40.000 41.000 41.000 5.000 7.000 1.275 37.350 °C
Temp LM23 63.850 64.850 65.850 69.850 70.850 71.850 71.850 5.000 7.000 1.696 69.041 °C
Temp LM3 45.000 45.000 45.000 48.000 50.000 51.000 52.000 5.000 6.000 1.351 47.890 °C
Temp LM4 47.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.857 50.936 °C
Temp LM5 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.870 50.946 °C
Temp LM6 55.850 56.850 57.850 58.850 61.850 68.850 74.850 4.000 12.000 1.836 59.519 °C
Temp LM7 48.850 48.850 49.850 50.850 51.850 54.850 56.850 2.000 6.000 0.849 50.945 °C
Temp LM8 43.000 43.000 44.000 45.000 46.000 46.000 47.000 2.000 3.000 0.766 45.130 °C
Temp LM9 36.500 37.000 37.500 39.500 46.500 52.000 53.000 9.000 15.000 2.707 40.002 °C
nSats 6.000 8.000 9.000 11.000 14.000 15.000 17.000 5.000 7.000 1.439 11.177 nSat 330.5 2383
Summary as CSV file


This server:

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

Notes:

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

Glossary:

frequency offset:
The difference between the ntpd calculated frequency and the local system clock frequency (usually in parts per million, ppm)
jitter, dispersion:
The short term change in a value. NTP measures Local Time Jitter, Refclock Jitter, and Server Jitter in seconds. Local Frequency Jitter is in ppm or ppb.
kurtosis, Kurt:
The kurtosis of a random variable X is the fourth standardized moment and is a dimension-less ratio. ntpviz uses the Pearson's moment coefficient of kurtosis. A normal distribution has a kurtosis of three. NIST describes a kurtosis over three as "heavy tailed" and one under three as "light tailed".
ms, millisecond:
One thousandth of a second = 0.001 seconds, 1e-3 seconds
mu, mean:
The arithmetic mean: the sum of all the values divided by the number of values. The formula for mu is: "mu = (∑xi) / N". Where xi denotes the data points and N is the number of data points.
ns, nanosecond:
One billionth of a second, also one thousandth of a microsecond, 0.000000001 seconds and 1e-9 seconds.
percentile:
The value below which a given percentage of values fall.
ppb, parts per billion:
Ratio between two values. These following are all the same: 1 ppb, one in one billion, 1/1,000,000,000, 0.000,000,001, 1e-9 and 0.000,000,1%
ppm, parts per million:
Ratio between two values. These following are all the same: 1 ppm, one in one million, 1/1,000,000, 0.000,001, and 0.000,1%
‰, parts per thousand:
Ratio between two values. These following are all the same: 1 ‰. one in one thousand, 1/1,000, 0.001, and 0.1%
refclock:
Reference clock, a local GPS module or other local source of time.
remote clock:
Any clock reached over the network, LAN or WAN. Also called a peer or server.
time offset:
The difference between the ntpd calculated time and the local system clock's time. Also called phase offset.
σ, sigma:
Sigma denotes the standard deviation (SD) and is centered on the arithmetic mean of the data set. The SD is simply the square root of the variance of the data set. Two sigma is simply twice the standard deviation. Three sigma is three times sigma. Smaller is better.
The formula for sigma is: "σ = √[ ∑(xi-mu)^2 / N ]". Where xi denotes the data points and N is the number of data points.
skewness, Skew:
The skewness of a random variable X is the third standardized moment and is a dimension-less ratio. ntpviz uses the Pearson's moment coefficient of skewness. Wikipedia describes it best: "The qualitative interpretation of the skew is complicated and unintuitive."
A normal distribution has a skewness of zero.
upstream clock:
Any server or reference clock used as a source of time.
µs, us, microsecond:
One millionth of a second, also one thousandth of a millisecond, 0.000,001 seconds, and 1e-6 seconds.



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