ntpviz
NTPfiend
fro75uk at yahoo.co.uk
Tue Mar 12 18:08:28 UTC 2019
Following on from recent suggestions, I experimented a bit.
First: Instead of producing 7-day ntpviz graphs, I just went for 24 hour
graphs. This reduced the nasty spikes to about 40% of previous, better
but not acceptable.
Second: the R Pi (hardware 0010) was overclocked at 800 MHz (normal is
700 MHz) and the governor set to fixed speed of performance. I also
tweaked /boot/config.txt
added nohz=off
commented out #dtparam=audio=on
corrected gpu_mem=0 to gpu_mem=16
No obvious difference [...but]
Third: ntpstats were slowly moved (hourly cronjob) to another machine
(an Odroid HC-2) running ntpsec (which compiled easily and quickly).
This has been running over 24 hours now
http://www.goldhill.uk/ntpvizplots/index.html and has completely solved
the problem. No nasty perfomance hits and the R Pi has settled down
nicely.
[...but] previously any small offset changes or jitter were rendered
invisible by the spikes, now much more visible with the much reduced
range of the y-axes. I'm wondering what else I will now notice !
For now, it seems like a decently performing setup. I'm still looking
for ntploggps to add GPS, plus temperature graphs sometime. I probably
ought to let it settle down for a while beforehand.
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