| Re: [chrony-dev] Frequency synchronization without phase |
[ Thread Index |
Date Index
| More chrony.tuxfamily.org/chrony-dev Archives
]
After letting it settle down after starting, the initial results
covering 14 hours: https://dan.drown.org/odroid/run5/tempcomp.png
Shows the tempcomp.log(purple, left axis) vs tracking.log(green, right axis)
The tempcomp factor has moved 200ppb (with some high frequency
movements), while the tracking factor has moved 70ppb (with much lower
frequency movements). I'll continue running this test to see how it
does over multiple days.
Reference is a stratum 1 GPS PPS NTP server over a switch. Pool
servers added for backup, but they weren't selected during this time.
A graph of the GPS PPS on the system itself, set as noselect, 2^4
poll. It's adjusted to match stratum 1's offset over the LAN. -
https://dan.drown.org/odroid/run5/pps.png
Snapshot of "chronyc sources ; chronyc sourcestats ; chronyc tracking"
210 Number of sources = 8
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#? NMEA 0 6 377 48 +25ms[ +25ms]
+/- 100ms
#? PPS 0 4 377 20 -258us[ -258us]
+/- 60ns
^- 4.53.160.75 2 10 377 1000 -5037us[-5038us]
+/- 61ms
^- 192.187.114.131 2 10 377 4 -3854us[-3854us]
+/- 52ms
^- propjet.latt.net 3 10 377 585 +922us[ +922us]
+/- 82ms
^- ntp.your.org 1 10 377 997 -3973us[-3974us]
+/- 24ms
^* beaglebone.lan 1 10 377 929 -3747ns[-5000ns]
+/- 597us
^- vps3.drown.org 2 10 377 90 -6616us[-6616us]
+/- 19ms
210 Number of sources = 8
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
NMEA 24 13 24m -0.756 0.563 +24ms 337us
PPS 5 3 63 -0.002 0.019 -258us 76ns
4.53.160.75 14 7 223m +0.166 0.371 -2550us 1235us
192.187.114.131 11 7 173m -0.174 0.484 -3195us 1124us
propjet.latt.net 15 9 241m +0.154 0.180 +1047us 790us
ntp.your.org 50 24 14h +0.031 0.043 -2829us 1234us
beaglebone.lan 10 7 155m -0.000 0.003 -32ns 4071ns
vps3.drown.org 51 26 14h +0.024 0.043 -4299us 1299us
Reference ID : 10.1.2.16 (beaglebone.lan)
Stratum : 2
Ref time (UTC) : Tue Nov 29 16:46:53 2016
System time : 0.000001633 seconds slow of NTP time
Last offset : -0.000001253 seconds
RMS offset : 0.000024332 seconds
Frequency : 22.927 ppm slow
Residual freq : -0.000 ppm
Skew : 0.003 ppm
Root delay : 0.000958 seconds
Root dispersion : 0.001000 seconds
Update interval : 1030.8 seconds
Leap status : Normal
--
To unsubscribe email chrony-dev-request@xxxxxxxxxxxxxxxxxxxx with "unsubscribe" in the subject.
For help email chrony-dev-request@xxxxxxxxxxxxxxxxxxxx with "help" in the subject.
Trouble? Email listmaster@xxxxxxxxxxxxxxxxxxxx.