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Re: [gpsd-dev] Print offset in ntpshmmon?


From: Eric S. Raymond
Subject: Re: [gpsd-dev] Print offset in ntpshmmon?
Date: Tue, 28 Apr 2015 08:14:26 -0400
User-agent: Mutt/1.5.23 (2014-03-12)

Gary E. Miller <address@hidden>:
> Yo Miroslav!
> 
> On Wed, 22 Apr 2015 08:43:29 +0200
> Miroslav Lichvar <address@hidden> wrote:
> 
> > Looking at the ntpshmviz code, it seems the clock timestamp is just
> > used to calculate the offset. If ntpshmmon did that, ntpshmviz could
> > use it directly and as a bonus there would be no loss in the precision
> > (avoiding substraction of two large close float values).
> 
> Gack. so even ntpshmviz gets the math wrong...
> 
> > -                    offset = (float(record[3]) - float(record[4]))
> > +                    offset = float(record[4])
> 
> Both are pretty bad....

You're the expert.  Please fix it.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>



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