After 7 days: https://dan.drown.org/odroid/run5.7/tempcomp.png
It looks like tempcomp is helpful but maybe my reference is drifting.
I want to try this again with a better TCXO.
Temperature vs tempcomp is an interesting graph:
Clock offset was within +/-94us 98% of the time. odroid's poll times
of its stratum 1 were between 512 and 1024 seconds. I think these are
pretty good numbers.
Looking at both the stratum 1 (BBB) and tempcomp stratum 2 (odroid)
from the perspective of a NTP client of both:
I setup a quick benchmark of heating the CPU and on-board crystal with
a bunch of cpu wasting processes. CPU core went from 51C to 70C (as
measured by the on-CPU temperature sensor):
The test of cpu heating actually turned out pretty well. The tempcomp
moves ~400ppb while the tracking moves less than 100ppb. The offset
stays within +/- 25us during this time (with a poll of its stratum 1
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