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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>



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