Time to slow down and be more careful

Gary E. Miller gem at rellim.com
Tue Apr 18 17:37:56 UTC 2017


Yo Eric!

On Tue, 18 Apr 2017 10:35:15 -0400
"Eric S. Raymond" <esr at thyrsus.com> wrote:

> Hm.  I need to stare at that code some more.  I'm beginning to think
> the pivot is the right idea implemented in a slightly wrong place.
> Maybe it ought to be applied to in-packet timestamps as soon as they
> arrive?

Finally!!!!

> > Either way could also check for time unreasonably far into the
> > future.  
> 
> Simpler: The last-modification time of /etc.  But that could foo up if
> /etc is ever modified at boot time before ntpd can sync the clock.

But /etc itself is infrequently updated, may be set by any package
install to something far in the past.  The time on the driftfile, if
present is usually to within an hour.  Better if always set on ntpd
shutdown.

Backstop that time with ntpd build time or a time in ntp.conf.

> Anyway, now I think we're moving in a constructive direction.

Good.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  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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