ntpd 1PPS binding considered awful

[Gary E. Miller]

Yo Eric!

On Mon, 9 May 2016 18:38:49 -0400
"Eric S. Raymond" <esr at thyrsus.com> wrote:

> Gary E. Miller <gem at rellim.com>:
> > > The Pi might be it.  I have it set up to monitor four pool servers
> > > with noselect.  I get output like this:  
> > 
> > Whoops, don't do that.  The full ntpd selection algorithm does not
> > work without at least 3 seeming good chimers.  
> 
> That can't be right.  How could you ever have an autonomous Stratum 1
> if that's true?  There has to be some way to say "trust this Stratum
> 0".

You only trust a stratum one that agrees with other stratum one's.  That
way a stratum one can stop using its local refclock if/when it goes
wacko, and still provide good time.  Like when a bird sits on your GPS
antenna.

And single time source may work, but it bypasses the grouping and
selection algorithms.  You want to see them work too.

And, as always, chronyd takes a different tack.  It has features that
ntpd does not for standalone operation.

> > And the pool has a ton of false tickers.  Best to at least use aUS
> > pool, and much better to pick some good public chimers near you.  
> 
> And that's another problem.  Supposing we really need other sources
> in the config, how are we going to tell time newbies to select them?
> Not practical.

Not practical for the HOWTO, but practical for you.  So, yes, and advanced
topic.  But for you to get confidence in how good your RasPi setup it, you
want to go one step beyond.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 473 bytes
Desc: OpenPGP digital signature
URL: <http://lists.ntpsec.org/pipermail/devel/attachments/20160509/49021e5b/attachment.bin>