ntpdig slew accuracy

Eric S. Raymond esr at thyrsus.com
Fri Apr 12 05:49:18 UTC 2019

Richard Laager via devel <devel at ntpsec.org>:
> The Debian man page for ntpdate has this BUGS section:
>  The  slew  adjustment  is actually 50% larger than the measured offset,
>  since this (it is argued) will tend to keep a badly drifting clock more
>  accurate.  This  is  probably not a good idea and may cause a troubling
>  hunt for some values of the kernel variables tick and tickadj.
> These days, ntpdate is just a wrapper around ntpdig. The NTPsec man page
> for ntpdig does not give any reason to think the slew is "50% larger".
> Can I assume that ntpdig's slewing is correct, and thus remove that BUGS
> section for ntpdate?

Yes.  That language is clearly wrong.
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

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