Paul Theodoropoulos paul at anastrophe.com
Tue Mar 12 19:11:55 UTC 2019

On 3/12/19 11:08, NTPfiend wrote:
> No obvious difference [...but]
Yup - all those tiny tweaks do make tiny differences. But tweaking the 
system is half the fun. :)
> 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.

Nice looking results. Ambient temperature fluctuations are now your 
biggest challenge. You'll also find that generating hourly or other 
sub-daily increments is pretty "lightweight" (in relative terms).  I 
generate 1, 3, 6, 12, 24 and 72 hour stats once per hour - which it 
takes ntpviz about 45 minutes to iterate through - then the seven day 
stats daily at 4am. The one hour stats only take four minutes to 
generate however.
> [...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 !
You can also change the clip option to deal with the occasional, 
inevitable spikes that will still happen (noise in your power, gps loss 
of signal, etc).

Paul Theodoropoulos

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