NTPsec

Kong

Report generated: Thu Jun 13 13:59:01 2024 UTC
Start Time: Thu Jun 6 13:59:01 2024 UTC
End Time: Thu Jun 13 13:59:01 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 -885.200 -116.331 -43.237 -2.362 38.902 173.707 481.238 82.139 290.038 47.615 -1.490 µs -6.082 102.9
Local Clock Frequency Offset 11.779 12.028 12.226 12.659 12.808 13.480 13.732 0.583 1.452 0.209 12.616 ppm 2.096e+05 1.246e+07

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 9.247 11.999 21.524 40.311 121.941 322.243 28.312 112.694 21.202 24.928 µs 8.565 92.13

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 3.995 5.306 10.506 42.720 93.531 180.934 37.414 89.536 16.810 14.657 ppb 4.484 30.08

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 -885.200 -116.331 -43.237 -2.362 38.902 173.707 481.238 82.139 290.038 47.615 -1.490 µs -6.082 102.9

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 11.779 12.028 12.226 12.659 12.808 13.480 13.732 0.583 1.452 0.209 12.616 ppm 2.096e+05 1.246e+07
Temp /dev/sda 47.000 48.000 49.000 50.000 52.000 53.000 54.000 3.000 5.000 0.979 50.235 °C
Temp /dev/sdb 36.000 37.000 38.000 39.000 41.000 44.000 44.000 3.000 7.000 1.148 39.284 °C
Temp LM0 47.000 49.000 50.000 54.000 58.000 59.000 59.000 8.000 10.000 2.845 53.768 °C
Temp LM1 45.250 46.250 47.000 48.875 53.875 75.250 86.875 6.875 29.000 4.334 49.780 °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 64.000 64.000 65.000 65.000 66.000 66.000 66.000 1.000 2.000 0.550 65.337 °C
Temp LM12 2.000 5.000 5.000 8.000 13.000 14.000 27.000 8.000 9.000 2.486 8.457 °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 46.000 46.000 46.000 47.000 48.000 48.000 49.000 2.000 2.000 0.656 47.268 °C
Temp LM15 38.000 39.000 40.000 42.000 44.000 64.000 75.000 4.000 25.000 3.472 42.037 °C
Temp LM16 69.000 69.500 69.500 70.500 71.000 71.000 71.500 1.500 1.500 0.398 70.294 °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 45.250 46.000 47.000 49.000 54.000 73.750 88.000 7.000 27.750 4.201 49.957 °C
Temp LM20 45.250 46.250 47.000 48.750 53.875 75.250 86.750 6.875 29.000 4.317 49.754 °C
Temp LM21 69.250 69.500 69.750 70.500 71.000 71.000 71.875 1.250 1.500 0.388 70.430 °C
Temp LM22 36.000 37.000 38.000 39.000 41.000 43.000 44.000 3.000 6.000 1.102 39.347 °C
Temp LM23 64.850 66.850 66.850 70.850 72.850 72.850 75.850 6.000 6.000 1.759 70.284 °C
Temp LM3 47.000 48.000 49.000 50.000 52.000 53.000 54.000 3.000 5.000 0.969 50.250 °C
Temp LM4 50.850 50.850 50.850 52.850 53.850 54.850 58.850 3.000 4.000 0.886 52.536 °C
Temp LM5 50.850 50.850 50.850 52.850 53.850 54.850 58.850 3.000 4.000 0.888 52.549 °C
Temp LM6 57.850 58.850 59.850 60.850 62.850 68.850 75.850 3.000 10.000 1.653 61.213 °C
Temp LM7 50.850 50.850 50.850 52.850 53.850 54.850 58.850 3.000 4.000 0.881 52.550 °C
Temp LM8 46.000 46.000 46.000 47.000 48.000 48.000 49.000 2.000 2.000 0.660 47.270 °C
Temp LM9 39.000 39.500 40.000 42.000 43.000 51.500 56.500 3.000 12.000 1.519 41.837 °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 8.000 9.000 10.000 12.000 14.000 15.000 17.000 4.000 6.000 1.382 11.840 nSat 456.2 3629
TDOP 0.800 0.880 0.950 1.410 2.460 3.190 5.020 1.510 2.310 0.488 1.517 17.12 65.07

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) -480.033 -0.162 -0.044 0.017 0.067 0.201 0.443 0.111 0.363 7.457 -0.101 ms -68.42 4409

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) -479.229 -0.296 -0.154 -0.024 0.080 0.575 1.473 0.234 0.871 14.763 -0.471 ms -36.59 1192

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) -2.697 -1.472 -1.088 -0.459 0.096 0.462 2.080 1.183 1.934 0.378 -0.481 ms -18.58 65

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 -479.158 -0.351 -0.279 -0.029 0.187 0.478 1.332 0.467 0.830 7.476 -0.145 ms -68.14 4371

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 -479.999 -0.167 -0.061 -0.028 0.012 0.258 1.497 0.073 0.425 10.575 -0.256 ms -49.49 2250

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) -476.486 -1.477 0.678 1.457 3.585 4.019 5.118 2.907 5.496 10.859 1.271 ms -47.06 2083

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) -480.926 -4.742 -4.232 -1.393 -0.811 -0.450 0.257 3.420 4.291 10.865 -1.827 ms -48.89 2146

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) -1.046 -1.046 77.661 370.355 694.678 938.331 938.331 617.017 939.377 207.516 370.945 µs 3.254 8.203

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) -0.845 -0.242 -0.068 0.377 0.856 1.096 3.337 0.924 1.338 0.295 0.380 ms 1.713 11.92

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) -614.714 -146.907 -143.403 -131.053 -124.717 -122.639 -119.621 18.686 24.269 6.456 -132.533 ms -1.005e+04 2.195e+05

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 3.434 5.243 15.341 58.386 90.614 328.017 53.143 87.180 21.545 21.777 µs 4.798 44.75

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 2.142 2.968 7.988 29.444 86.540 410.005 26.476 84.398 18.339 12.113 µs 8.317 123.7

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 2001:67c: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 0.202 0.314 1.898 10.701 20.398 32.870 10.387 20.196 4.071 3.387 ms 2.232 12.08

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 1.913 3.293 10.943 33.301 88.041 436.723 30.008 86.128 18.825 14.723 µs 9.162 148.7

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 204.17.205.30

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 2.077 3.693 13.072 47.022 132.001 693.066 43.329 129.924 35.406 19.653 µs 9.684 147.7

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 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 0.210 0.326 1.983 9.596 21.262 174.452 9.270 21.053 5.481 3.402 ms 15.43 466.4

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) 0.000 0.185 0.284 1.060 6.169 14.928 47.846 5.886 14.742 3.070 1.874 ms 5.958 75.7

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

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

RMS Jitter is field 8 in the peerstats log file.



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

peer jitter 2606:4700:f1::1 plot

Percentiles...... Ranges...... Skew- Kurt-
Name Min1%5%50%95% 99%Max   90%98%StdDev  MeanUnits nessosis
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.232 0.232 0.252 0.532 1.411 1.594 1.594 1.158 1.362 0.352 0.615 ms 3.8 10.52

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) 0.000 0.174 0.248 0.719 3.985 8.984 13.365 3.737 8.810 1.655 1.263 ms 2.857 14.91

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 0.343 0.529 4.061 10.300 12.699 480.071 9.771 12.357 5.292 4.451 ms 38.31 2763

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 11.779 12.028 12.226 12.659 12.808 13.480 13.732 0.583 1.452 0.209 12.616 ppm 2.096e+05 1.246e+07
Local Clock Time Offset -885.200 -116.331 -43.237 -2.362 38.902 173.707 481.238 82.139 290.038 47.615 -1.490 µs -6.082 102.9
Local RMS Frequency Jitter 0.000 3.995 5.306 10.506 42.720 93.531 180.934 37.414 89.536 16.810 14.657 ppb 4.484 30.08
Local RMS Time Jitter 0.119 9.247 11.999 21.524 40.311 121.941 322.243 28.312 112.694 21.202 24.928 µs 8.565 92.13
Server Jitter 2001:470:e815::24 (pi4.rellim.com) 0.000 3.434 5.243 15.341 58.386 90.614 328.017 53.143 87.180 21.545 21.777 µs 4.798 44.75
Server Jitter 2001:470:e815::8 (spidey.rellim.com) 0.000 2.142 2.968 7.988 29.444 86.540 410.005 26.476 84.398 18.339 12.113 µs 8.317 123.7
Server Jitter 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) 0.000 0.202 0.314 1.898 10.701 20.398 32.870 10.387 20.196 4.071 3.387 ms 2.232 12.08
Server Jitter 204.17.205.1 0.000 1.913 3.293 10.943 33.301 88.041 436.723 30.008 86.128 18.825 14.723 µs 9.162 148.7
Server Jitter 204.17.205.30 0.000 2.077 3.693 13.072 47.022 132.001 693.066 43.329 129.924 35.406 19.653 µs 9.684 147.7
Server Jitter 2405:fc00::1 (robusta.dcs1.biz) 0.000 0.210 0.326 1.983 9.596 21.262 174.452 9.270 21.053 5.481 3.402 ms 15.43 466.4
Server Jitter 2604:a880:1:20::17:5001 (ntp1.glypnod.com) 0.000 0.185 0.284 1.060 6.169 14.928 47.846 5.886 14.742 3.070 1.874 ms 5.958 75.7
Server Jitter 2606:4700:f1::1 (time.cloudflare.com) 0.232 0.232 0.252 0.532 1.411 1.594 1.594 1.158 1.362 0.352 0.615 ms 3.8 10.52
Server Jitter 2606:4700:f1::123 (time.cloudflare.com) 0.000 0.174 0.248 0.719 3.985 8.984 13.365 3.737 8.810 1.655 1.263 ms 2.857 14.91
Server Jitter SHM(0) 0.000 0.343 0.529 4.061 10.300 12.699 480.071 9.771 12.357 5.292 4.451 ms 38.31 2763
Server Offset 2001:470:e815::24 (pi4.rellim.com) -480.033 -0.162 -0.044 0.017 0.067 0.201 0.443 0.111 0.363 7.457 -0.101 ms -68.42 4409
Server Offset 2001:470:e815::8 (spidey.rellim.com) -479.229 -0.296 -0.154 -0.024 0.080 0.575 1.473 0.234 0.871 14.763 -0.471 ms -36.59 1192
Server Offset 2001:67c:1270:0:dea6:32ff:feaf:803b (khronos.mikieboy.net) -2.697 -1.472 -1.088 -0.459 0.096 0.462 2.080 1.183 1.934 0.378 -0.481 ms -18.58 65
Server Offset 204.17.205.1 -479.158 -0.351 -0.279 -0.029 0.187 0.478 1.332 0.467 0.830 7.476 -0.145 ms -68.14 4371
Server Offset 204.17.205.30 -479.999 -0.167 -0.061 -0.028 0.012 0.258 1.497 0.073 0.425 10.575 -0.256 ms -49.49 2250
Server Offset 2405:fc00::1 (robusta.dcs1.biz) -476.486 -1.477 0.678 1.457 3.585 4.019 5.118 2.907 5.496 10.859 1.271 ms -47.06 2083
Server Offset 2604:a880:1:20::17:5001 (ntp1.glypnod.com) -480.926 -4.742 -4.232 -1.393 -0.811 -0.450 0.257 3.420 4.291 10.865 -1.827 ms -48.89 2146
Server Offset 2606:4700:f1::1 (time.cloudflare.com) -1.046 -1.046 77.661 370.355 694.678 938.331 938.331 617.017 939.377 207.516 370.945 µs 3.254 8.203
Server Offset 2606:4700:f1::123 (time.cloudflare.com) -0.845 -0.242 -0.068 0.377 0.856 1.096 3.337 0.924 1.338 0.295 0.380 ms 1.713 11.92
Server Offset SHM(0) -614.714 -146.907 -143.403 -131.053 -124.717 -122.639 -119.621 18.686 24.269 6.456 -132.533 ms -1.005e+04 2.195e+05
TDOP 0.800 0.880 0.950 1.410 2.460 3.190 5.020 1.510 2.310 0.488 1.517 17.12 65.07
Temp /dev/sda 47.000 48.000 49.000 50.000 52.000 53.000 54.000 3.000 5.000 0.979 50.235 °C
Temp /dev/sdb 36.000 37.000 38.000 39.000 41.000 44.000 44.000 3.000 7.000 1.148 39.284 °C
Temp LM0 47.000 49.000 50.000 54.000 58.000 59.000 59.000 8.000 10.000 2.845 53.768 °C
Temp LM1 45.250 46.250 47.000 48.875 53.875 75.250 86.875 6.875 29.000 4.334 49.780 °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 64.000 64.000 65.000 65.000 66.000 66.000 66.000 1.000 2.000 0.550 65.337 °C
Temp LM12 2.000 5.000 5.000 8.000 13.000 14.000 27.000 8.000 9.000 2.486 8.457 °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 46.000 46.000 46.000 47.000 48.000 48.000 49.000 2.000 2.000 0.656 47.268 °C
Temp LM15 38.000 39.000 40.000 42.000 44.000 64.000 75.000 4.000 25.000 3.472 42.037 °C
Temp LM16 69.000 69.500 69.500 70.500 71.000 71.000 71.500 1.500 1.500 0.398 70.294 °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 45.250 46.000 47.000 49.000 54.000 73.750 88.000 7.000 27.750 4.201 49.957 °C
Temp LM20 45.250 46.250 47.000 48.750 53.875 75.250 86.750 6.875 29.000 4.317 49.754 °C
Temp LM21 69.250 69.500 69.750 70.500 71.000 71.000 71.875 1.250 1.500 0.388 70.430 °C
Temp LM22 36.000 37.000 38.000 39.000 41.000 43.000 44.000 3.000 6.000 1.102 39.347 °C
Temp LM23 64.850 66.850 66.850 70.850 72.850 72.850 75.850 6.000 6.000 1.759 70.284 °C
Temp LM3 47.000 48.000 49.000 50.000 52.000 53.000 54.000 3.000 5.000 0.969 50.250 °C
Temp LM4 50.850 50.850 50.850 52.850 53.850 54.850 58.850 3.000 4.000 0.886 52.536 °C
Temp LM5 50.850 50.850 50.850 52.850 53.850 54.850 58.850 3.000 4.000 0.888 52.549 °C
Temp LM6 57.850 58.850 59.850 60.850 62.850 68.850 75.850 3.000 10.000 1.653 61.213 °C
Temp LM7 50.850 50.850 50.850 52.850 53.850 54.850 58.850 3.000 4.000 0.881 52.550 °C
Temp LM8 46.000 46.000 46.000 47.000 48.000 48.000 49.000 2.000 2.000 0.660 47.270 °C
Temp LM9 39.000 39.500 40.000 42.000 43.000 51.500 56.500 3.000 12.000 1.519 41.837 °C
nSats 8.000 9.000 10.000 12.000 14.000 15.000 17.000 4.000 6.000 1.382 11.840 nSat 456.2 3629
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.



This page autogenerated by ntpviz, part of the NTPsec project
html 5    Valid CSS!