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Re: [gpsd-dev] [PATCH] Hal Murray's explanations of how ntpd drift works
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-dev] [PATCH] Hal Murray's explanations of how ntpd drift works |
Date: |
Mon, 4 Nov 2013 10:02:25 -0500 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Andy Walls <address@hidden>:
>
>
> On Mon, 2013-11-04 at 11:59 +0800, Sanjeev Gupta wrote:
>
>
> > diff --git a/www/gpsd-time-service-howto.txt
> > b/www/gpsd-time-service-howto.txt
> > index 7aa250f..d32c8b7 100644
> > --- a/www/gpsd-time-service-howto.txt
> > +++ b/www/gpsd-time-service-howto.txt
>
> > +If you turn on logging for loopstats, that will record both offset, drift,
> > +and the polling interval It's easy to feed to gnuplot, see the sample
> > +scripts provided with this file *FIX-ME*
> > +
>
> The gnuplot commands for the loopstats file are here:
>
> http://lists.gnu.org/archive/html/gpsd-dev/2013-10/msg00152.html
>
> Offset
> gnuplot> plot "loopstats" using ($2):($3) with lines 1
>
> Offset with jitter as errorbars
> gnuplot> replot "loopstats" using ($2):($3):($5) with yerrorbars 2
>
> Frequency offset
> gnuplot> plot "loopstats" using ($2):($4) with lines 1
>
> Frequency offset with frequency jitter as errorbars
> gnuplot> replot "loopstats" using ($2):($4):($6) with yerrorbars 2
>
> Regards,
> Andy
>
Patch, please.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>