Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Local Clock Time Offset | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 56.306 | 1.092 | s | 47.65 | 2462 | |||
Local Clock Frequency Offset | -4.612 | -4.516 | -4.328 | -4.129 | -4.078 | -3.996 | -3.963 | 0.250 | 0.520 | 0.093 | -4.160 | ppm | -9.483e+04 | 4.329e+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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Local RMS Time Jitter | 0.000 | 0.033 | 0.041 | 0.090 | 0.535 | 83.690 | 164.800 | 0.494 | 83.657 | 13.147 | 2.209 | µs | 3.637 | 32.72 |
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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Local RMS Frequency Jitter | 0.000 | 0.000 | 1.000 | 5.000 | 59.000 | 162.000 | 462.000 | 58.000 | 162.000 | 30.018 | 14.278 | ppb | 3.912 | 39.72 |
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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Local Clock Offset | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 56.306 | 1.092 | s | 47.65 | 2462 |
The clock offsets of the local clock as a histogram.
The Local Clock Offset is field 3 from the loopstats log file.
The offset of all refclocks, peers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset 192.36.143.150 | -0.000 | -0.000 | -0.000 | -0.000 | -0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 228.863 | 18.150 | s | 8.988 | 117.7 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset 192.36.143.151 | -0.000 | -0.000 | -0.000 | -0.000 | -0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 238.702 | 19.755 | s | 8.477 | 106.7 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset 194.58.202.148 | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.001 | 254.690 | 22.512 | s | 7.733 | 91.75 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset 194.58.202.20 | -0.000 | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 250.860 | 21.835 | s | 7.902 | 95.06 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset 194.58.205.148 | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 263.991 | 24.200 | s | 7.343 | 84.34 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset GPS | -310.900 | -244.100 | -147.400 | -11.550 | 36.020 | 333.000 | 661.700 | 183.420 | 577.100 | 79.726 | -19.322 | ms | -3.961 | 20.84 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Offset PPS | -5.428 | -0.972 | -0.256 | 0.003 | 0.245 | 0.583 | 223.400 | 0.501 | 1.555 | 4.402 | 0.079 | µs | 46.62 | 2371 |
The offset of a peer or 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 remote. 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 peer 80µs; 90% ranges for WAN servers 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.
The RMS Jitter of all refclocks, peers 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter 192.36.143.150 | 0.581 | 2.343 | 9.800 | 19.840 | 35.990 | 55.090 | 64.380 | 26.190 | 52.747 | 9.142 | 22.075 | µs | 7.959 | 26.41 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter 192.36.143.151 | 0.408 | 1.457 | 8.367 | 23.030 | 36.630 | 65.650 | 73.560 | 28.263 | 64.193 | 10.054 | 23.563 | µs | 7.606 | 28.5 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter 194.58.202.148 | 18.290 | 19.070 | 22.400 | 56.190 | 83.900 | 139.500 | 162.300 | 61.500 | 120.430 | 22.597 | 52.929 | µs | 7.789 | 28.77 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter 194.58.202.20 | 0.813 | 2.792 | 12.030 | 21.630 | 46.920 | 102.900 | 137.300 | 34.890 | 100.108 | 16.374 | 25.321 | µs | 5.625 | 32.91 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter 194.58.205.148 | 0.453 | 3.236 | 12.060 | 33.460 | 65.610 | 94.660 | 146.900 | 53.550 | 91.424 | 18.531 | 34.206 | µs | 5.662 | 27.77 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter GPS | 0.081 | 4.373 | 6.507 | 11.040 | 96.100 | 202.500 | 335.000 | 89.593 | 198.127 | 34.213 | 22.196 | ms | 3.109 | 17.99 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Peer Jitter PPS | 0.023 | 0.068 | 0.105 | 0.185 | 0.494 | 1.001 | 1.931 | 0.389 | 0.933 | 0.172 | 0.229 | µs | 5.699 | 40.29 |
The RMS Jitter of a remote peer or 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.
Percentiles...... | Ranges...... | Skew- | Kurt- | ||||||||||||||
Name | Min | 1% | 5% | 50% | 95% | 99% | Max | 90% | 98% | StdDev | Mean | Units | ness | osis | |||
Local Clock Frequency Offset | -4.612 | -4.516 | -4.328 | -4.129 | -4.078 | -3.996 | -3.963 | 0.250 | 0.520 | 0.093 | -4.160 | ppm | -9.483e+04 | 4.329e+06 | |||
Local Clock Time Offset | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 56.306 | 1.092 | s | 47.65 | 2462 | |||
Local RMS Frequency Jitter | 0.000 | 0.000 | 1.000 | 5.000 | 59.000 | 162.000 | 462.000 | 58.000 | 162.000 | 30.018 | 14.278 | ppb | 3.912 | 39.72 | |||
Local RMS Time Jitter | 0.000 | 0.033 | 0.041 | 0.090 | 0.535 | 83.690 | 164.800 | 0.494 | 83.657 | 13.147 | 2.209 | µs | 3.637 | 32.72 | |||
Peer Jitter 192.36.143.150 | 0.581 | 2.343 | 9.800 | 19.840 | 35.990 | 55.090 | 64.380 | 26.190 | 52.747 | 9.142 | 22.075 | µs | 7.959 | 26.41 | |||
Peer Jitter 192.36.143.151 | 0.408 | 1.457 | 8.367 | 23.030 | 36.630 | 65.650 | 73.560 | 28.263 | 64.193 | 10.054 | 23.563 | µs | 7.606 | 28.5 | |||
Peer Jitter 194.58.202.148 | 18.290 | 19.070 | 22.400 | 56.190 | 83.900 | 139.500 | 162.300 | 61.500 | 120.430 | 22.597 | 52.929 | µs | 7.789 | 28.77 | |||
Peer Jitter 194.58.202.20 | 0.813 | 2.792 | 12.030 | 21.630 | 46.920 | 102.900 | 137.300 | 34.890 | 100.108 | 16.374 | 25.321 | µs | 5.625 | 32.91 | |||
Peer Jitter 194.58.205.148 | 0.453 | 3.236 | 12.060 | 33.460 | 65.610 | 94.660 | 146.900 | 53.550 | 91.424 | 18.531 | 34.206 | µs | 5.662 | 27.77 | |||
Peer Jitter GPS | 0.081 | 4.373 | 6.507 | 11.040 | 96.100 | 202.500 | 335.000 | 89.593 | 198.127 | 34.213 | 22.196 | ms | 3.109 | 17.99 | |||
Peer Jitter PPS | 0.023 | 0.068 | 0.105 | 0.185 | 0.494 | 1.001 | 1.931 | 0.389 | 0.933 | 0.172 | 0.229 | µs | 5.699 | 40.29 | |||
Peer Offset 192.36.143.150 | -0.000 | -0.000 | -0.000 | -0.000 | -0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 228.863 | 18.150 | s | 8.988 | 117.7 | |||
Peer Offset 192.36.143.151 | -0.000 | -0.000 | -0.000 | -0.000 | -0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 238.702 | 19.755 | s | 8.477 | 106.7 | |||
Peer Offset 194.58.202.148 | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.001 | 254.690 | 22.512 | s | 7.733 | 91.75 | |||
Peer Offset 194.58.202.20 | -0.000 | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 250.860 | 21.835 | s | 7.902 | 95.06 | |||
Peer Offset 194.58.205.148 | -0.000 | -0.000 | -0.000 | 0.000 | 0.000 | 0.000 | 2,904.000 | 0.000 | 0.000 | 263.991 | 24.200 | s | 7.343 | 84.34 | |||
Peer Offset GPS | -310.900 | -244.100 | -147.400 | -11.550 | 36.020 | 333.000 | 661.700 | 183.420 | 577.100 | 79.726 | -19.322 | ms | -3.961 | 20.84 | |||
Peer Offset PPS | -5.428 | -0.972 | -0.256 | 0.003 | 0.245 | 0.583 | 223.400 | 0.501 | 1.555 | 4.402 | 0.079 | µs | 46.62 | 2371 |