Re: [chrony-dev] Frequency synchronization without phase

[Dan Drown <dan-ntp@xxxxxxxxx>]

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:  
https://dan.drown.org/odroid/run5.7/tempcomp-temps.png

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:
https://dan.drown.org/odroid/run5.7/sandfish.html


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):  
https://dan.drown.org/odroid/run5.7/tempcomp-cpuheating.png

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  
at 64s).

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