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




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