NTPsec

Kong

Report generated: Tue Apr 22 13:59:01 2025 UTC
Start Time: Tue Apr 15 13:59:00 2025 UTC
End Time: Tue Apr 22 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 -592.648 -156.030 -62.349 -1.456 50.685 187.364 662.533 113.034 343.394 57.229 -1.619 µs 1.724 40.1
Local Clock Frequency Offset 11.474 11.540 11.569 11.750 13.873 14.050 14.084 2.304 2.510 0.607 12.057 ppm 1.882 6.299

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 8.138 10.678 14.201 25.878 53.212 104.355 188.115 39.011 93.677 16.650 29.805 µs 3.274 19.05

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 3.164 5.333 6.964 14.009 55.940 151.471 225.712 48.976 146.138 24.390 20.488 ppb 4.505 26.28

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 -592.648 -156.030 -62.349 -1.456 50.685 187.364 662.533 113.034 343.394 57.229 -1.619 µs 1.724 40.1

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 11.474 11.540 11.569 11.750 13.873 14.050 14.084 2.304 2.510 0.607 12.057 ppm 1.882 6.299
Temp /dev/nvme0n1 63.000 65.000 67.000 70.000 71.000 72.000 75.000 4.000 7.000 1.454 69.672 °C
Temp /dev/nvme1n1 48.000 49.000 50.000 51.000 53.000 55.000 57.000 3.000 6.000 0.959 51.077 °C
Temp /dev/sda 44.000 45.000 45.000 48.000 49.000 50.000 51.000 4.000 5.000 1.476 47.535 °C
Temp /dev/sdb 33.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.422 35.741 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 59.000 59.000 8.000 10.000 2.707 54.250 °C
Temp LM1 37.125 37.625 38.250 42.000 73.875 75.375 84.875 35.625 37.750 10.038 46.048 °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 61.000 62.000 62.000 63.000 64.000 65.000 65.000 2.000 3.000 0.629 62.699 °C
Temp LM12 1.000 3.000 6.000 21.000 28.000 33.000 37.000 22.000 30.000 6.639 19.162 °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 43.000 43.000 43.000 45.000 46.000 46.000 47.000 3.000 3.000 0.707 44.557 °C
Temp LM15 32.000 33.000 33.000 36.000 62.000 64.000 73.000 29.000 31.000 7.785 39.026 °C
Temp LM16 66.500 67.000 67.500 68.000 69.000 69.500 70.000 1.500 2.500 0.527 68.074 °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 36.750 37.500 38.000 42.250 72.750 75.000 83.500 34.750 37.500 9.592 45.729 °C
Temp LM20 37.000 37.625 38.125 42.000 73.875 75.375 84.875 35.750 37.750 10.035 46.033 °C
Temp LM21 66.500 67.250 67.500 68.125 69.250 69.750 70.000 1.750 2.500 0.517 68.217 °C
Temp LM22 33.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.384 35.814 °C
Temp LM23 62.850 64.850 66.850 69.850 70.850 71.850 74.850 4.000 7.000 1.455 69.527 °C
Temp LM3 44.000 45.000 45.000 48.000 49.000 50.000 51.000 4.000 5.000 1.480 47.539 °C
Temp LM4 47.850 48.850 49.850 50.850 52.850 54.850 56.850 3.000 6.000 0.968 50.919 °C
Temp LM5 47.850 48.850 49.850 50.850 52.850 54.850 56.850 3.000 6.000 0.968 50.928 °C
Temp LM6 55.850 56.850 57.850 58.850 62.850 70.850 74.850 5.000 14.000 2.173 59.605 °C
Temp LM7 47.850 48.850 49.850 50.850 52.850 54.850 56.850 3.000 6.000 0.958 50.930 °C
Temp LM8 43.000 43.000 43.000 45.000 46.000 46.000 47.000 3.000 3.000 0.704 44.557 °C
Temp LM9 33.000 33.500 33.500 36.000 51.000 52.500 54.500 17.500 19.000 4.385 37.479 °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 3.000 5.000 6.000 9.000 11.000 13.000 14.000 5.000 8.000 1.645 8.748 nSat 0.01285 3.038
TDOP 0.710 0.870 1.040 1.610 3.950 7.300 98.350 2.910 6.430 2.295 2.012 16.99 429.5

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) -576.353 -148.743 -71.547 8.680 72.174 241.165 736.108 143.721 389.908 64.541 7.953 µs 2.073 35.01

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 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) -853.598 -496.903 -393.222 36.934 218.114 302.068 687.689 611.336 798.971 178.714 -6.393 µs -0.9572 4.076

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 -2,257.123 -717.235 -390.708 -16.358 358.062 850.671 1,273.211 748.770 1,567.906 287.398 -14.078 µs -1.055 13.86

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 -626.789 -178.315 -88.751 -14.371 47.028 192.214 628.351 135.779 370.529 62.654 -15.168 µs 0.4879 32.98

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) 0.414 2.333 2.605 3.109 3.707 3.980 4.794 1.102 1.647 0.349 3.126 ms -0.1111 5.608

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) -3.178 -1.279 -1.012 -0.516 0.160 0.446 2.721 1.172 1.725 0.363 -0.484 ms 0.158 9.816

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) -1.950 -0.566 -0.355 0.551 0.843 1.146 1.436 1.198 1.712 0.358 0.468 ms -1.736 8.079

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) -0.933 -0.502 -0.103 0.522 0.844 1.004 1.652 0.947 1.506 0.276 0.484 ms -1.327 6.877

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) -173.145 -136.934 -131.752 -127.161 -122.818 -121.118 -117.476 8.934 15.815 3.035 -127.291 ms -1.38 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 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) 1.357 3.611 5.870 51.506 146.798 178.822 442.998 140.928 175.211 48.140 61.861 µs 0.7026 3.367

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) 1.303 2.546 4.121 27.701 133.349 176.151 260.053 129.228 173.605 44.359 42.471 µs 1.541 4.588

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 1.694 3.470 5.714 38.326 166.558 195.219 277.872 160.844 191.749 55.445 62.462 µs 0.8286 2.482

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 1.797 4.926 8.532 51.904 171.507 216.364 702.638 162.975 211.438 60.286 71.263 µs 1.988 13.58

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) 0.147 0.217 0.305 0.946 3.407 12.419 135.042 3.102 12.203 5.447 1.699 ms 15.28 288.4

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) 0.076 0.189 0.271 0.721 2.322 11.395 71.601 2.051 11.206 3.641 1.239 ms 12.15 169.2

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) 0.059 0.138 0.218 0.507 1.394 3.393 21.266 1.176 3.256 1.360 0.709 ms 13.14 196.6

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) 0.086 0.172 0.233 0.497 1.589 4.285 56.910 1.355 4.113 1.826 0.739 ms 22.91 664.2

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) 0.105 0.258 0.368 0.923 3.168 9.147 44.793 2.799 8.889 1.617 1.319 ms 6.201 69.7

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 11.474 11.540 11.569 11.750 13.873 14.050 14.084 2.304 2.510 0.607 12.057 ppm 1.882 6.299
Local Clock Time Offset -592.648 -156.030 -62.349 -1.456 50.685 187.364 662.533 113.034 343.394 57.229 -1.619 µs 1.724 40.1
Local RMS Frequency Jitter 3.164 5.333 6.964 14.009 55.940 151.471 225.712 48.976 146.138 24.390 20.488 ppb 4.505 26.28
Local RMS Time Jitter 8.138 10.678 14.201 25.878 53.212 104.355 188.115 39.011 93.677 16.650 29.805 µs 3.274 19.05
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 1.357 3.611 5.870 51.506 146.798 178.822 442.998 140.928 175.211 48.140 61.861 µs 0.7026 3.367
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 1.303 2.546 4.121 27.701 133.349 176.151 260.053 129.228 173.605 44.359 42.471 µs 1.541 4.588
Server Jitter 204.17.205.1 1.694 3.470 5.714 38.326 166.558 195.219 277.872 160.844 191.749 55.445 62.462 µs 0.8286 2.482
Server Jitter 204.17.205.30 1.797 4.926 8.532 51.904 171.507 216.364 702.638 162.975 211.438 60.286 71.263 µs 1.988 13.58
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.147 0.217 0.305 0.946 3.407 12.419 135.042 3.102 12.203 5.447 1.699 ms 15.28 288.4
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.076 0.189 0.271 0.721 2.322 11.395 71.601 2.051 11.206 3.641 1.239 ms 12.15 169.2
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.059 0.138 0.218 0.507 1.394 3.393 21.266 1.176 3.256 1.360 0.709 ms 13.14 196.6
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.086 0.172 0.233 0.497 1.589 4.285 56.910 1.355 4.113 1.826 0.739 ms 22.91 664.2
Server Jitter SHM(0) 0.105 0.258 0.368 0.923 3.168 9.147 44.793 2.799 8.889 1.617 1.319 ms 6.201 69.7
Server Offset 2001:470:e815::24 (pi4.rellim.com) -576.353 -148.743 -71.547 8.680 72.174 241.165 736.108 143.721 389.908 64.541 7.953 µs 2.073 35.01
Server Offset 2001:470:e815::8 (spidey.rellim.com) -853.598 -496.903 -393.222 36.934 218.114 302.068 687.689 611.336 798.971 178.714 -6.393 µs -0.9572 4.076
Server Offset 204.17.205.1 -2,257.123 -717.235 -390.708 -16.358 358.062 850.671 1,273.211 748.770 1,567.906 287.398 -14.078 µs -1.055 13.86
Server Offset 204.17.205.30 -626.789 -178.315 -88.751 -14.371 47.028 192.214 628.351 135.779 370.529 62.654 -15.168 µs 0.4879 32.98
Server Offset 2405:fc00::1 (robusta.dcs1.biz) 0.414 2.333 2.605 3.109 3.707 3.980 4.794 1.102 1.647 0.349 3.126 ms -0.1111 5.608
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -3.178 -1.279 -1.012 -0.516 0.160 0.446 2.721 1.172 1.725 0.363 -0.484 ms 0.158 9.816
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.950 -0.566 -0.355 0.551 0.843 1.146 1.436 1.198 1.712 0.358 0.468 ms -1.736 8.079
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -0.933 -0.502 -0.103 0.522 0.844 1.004 1.652 0.947 1.506 0.276 0.484 ms -1.327 6.877
Server Offset SHM(0) -173.145 -136.934 -131.752 -127.161 -122.818 -121.118 -117.476 8.934 15.815 3.035 -127.291 ms -1.38 12
TDOP 0.710 0.870 1.040 1.610 3.950 7.300 98.350 2.910 6.430 2.295 2.012 16.99 429.5
Temp /dev/nvme0n1 63.000 65.000 67.000 70.000 71.000 72.000 75.000 4.000 7.000 1.454 69.672 °C
Temp /dev/nvme1n1 48.000 49.000 50.000 51.000 53.000 55.000 57.000 3.000 6.000 0.959 51.077 °C
Temp /dev/sda 44.000 45.000 45.000 48.000 49.000 50.000 51.000 4.000 5.000 1.476 47.535 °C
Temp /dev/sdb 33.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.422 35.741 °C
Temp LM0 48.000 49.000 50.000 55.000 58.000 59.000 59.000 8.000 10.000 2.707 54.250 °C
Temp LM1 37.125 37.625 38.250 42.000 73.875 75.375 84.875 35.625 37.750 10.038 46.048 °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 61.000 62.000 62.000 63.000 64.000 65.000 65.000 2.000 3.000 0.629 62.699 °C
Temp LM12 1.000 3.000 6.000 21.000 28.000 33.000 37.000 22.000 30.000 6.639 19.162 °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 43.000 43.000 43.000 45.000 46.000 46.000 47.000 3.000 3.000 0.707 44.557 °C
Temp LM15 32.000 33.000 33.000 36.000 62.000 64.000 73.000 29.000 31.000 7.785 39.026 °C
Temp LM16 66.500 67.000 67.500 68.000 69.000 69.500 70.000 1.500 2.500 0.527 68.074 °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 36.750 37.500 38.000 42.250 72.750 75.000 83.500 34.750 37.500 9.592 45.729 °C
Temp LM20 37.000 37.625 38.125 42.000 73.875 75.375 84.875 35.750 37.750 10.035 46.033 °C
Temp LM21 66.500 67.250 67.500 68.125 69.250 69.750 70.000 1.750 2.500 0.517 68.217 °C
Temp LM22 33.000 33.000 33.000 36.000 38.000 39.000 40.000 5.000 6.000 1.384 35.814 °C
Temp LM23 62.850 64.850 66.850 69.850 70.850 71.850 74.850 4.000 7.000 1.455 69.527 °C
Temp LM3 44.000 45.000 45.000 48.000 49.000 50.000 51.000 4.000 5.000 1.480 47.539 °C
Temp LM4 47.850 48.850 49.850 50.850 52.850 54.850 56.850 3.000 6.000 0.968 50.919 °C
Temp LM5 47.850 48.850 49.850 50.850 52.850 54.850 56.850 3.000 6.000 0.968 50.928 °C
Temp LM6 55.850 56.850 57.850 58.850 62.850 70.850 74.850 5.000 14.000 2.173 59.605 °C
Temp LM7 47.850 48.850 49.850 50.850 52.850 54.850 56.850 3.000 6.000 0.958 50.930 °C
Temp LM8 43.000 43.000 43.000 45.000 46.000 46.000 47.000 3.000 3.000 0.704 44.557 °C
Temp LM9 33.000 33.500 33.500 36.000 51.000 52.500 54.500 17.500 19.000 4.385 37.479 °C
nSats 3.000 5.000 6.000 9.000 11.000 13.000 14.000 5.000 8.000 1.645 8.748 nSat 0.01285 3.038
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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