Yo Achim! On Mon, 09 Jan 2017 20:46:26 +0100 Achim Gratz <[email protected]> wrote:
> Hal Murray writes: > > [email protected] said: > >> Ths plot is NTP drift vs. temp. > > > > No, that's a plot of temp vs time and another plot from a different > > file of drift vs time. If you can capture both at the same time > > then you can ignore the time in the file and plot drift vs temp. > > http://users.megapathdsl.net/~hmurray/ntp/slope.gif > > Do you really mean "frequency drift" or rather "frequency offset"? > From the values it looks like you meant the NTP loop offset. Specifially it is field 4 of the loopstats file. I'm just using the 'standard' NTP terminology. In NTP land both terms are used for the same thing. I'm not gonna fight 20+ years of existing usage, but in ntpviz I only refer to it as 'Frequency Offset'. But it is the same thing written to the driftfile, so it is also the drift. > > You can probably do it with some post processing to merge 2 files. > > For me, it was easier to fix the data collection side. > > Merging two files actually is easy, provided that the timestamps align > exactly: > > join --nocheck-order -a1 -j1 ppswatch.txt loop.stats > joined.txt adly they do not align exactly. gps-log by default logs every 5 seconds in one file, and ntpd logs to loopstats when it feels like it. In practice when I plot with gnuplot the data is oversampled so the end results looks the same. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 [email protected] Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can’t measure it, you can’t improve it." - Lord Kelvin
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