-g screqup (from IRC)

Gary E. Miller gem at rellim.com
Mon Sep 12 20:34:24 UTC 2016

Yo Hal!

On Mon, 12 Sep 2016 13:26:38 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:

> > 12:09:40    gemiller
> >                      | "killall ntpd; sleep 1; ntpd -N -g" 
> >                      | screws up the clock for over a day,
> >                      | much better without the -g   
> You have either found a very interesting bug or you are on a wild
> goose chase.

Intersting, but not new.  I've been complaining about btpd startup
for a while.  -g is just one aspect of it.

> The -g switch is supposed to be very simple.  It allows a large
> initial step. Other than that, it shouldn't do anything.

Sadly, simple things have bad consequences.  See all my previous posts
about nntpd bad startup behavior.

> Are you getting steps at all?  grep your ntpd.log for "clock_step".
> It needs lots of logging turned on.  You can test it with the bump
> option in ntpfrob.

Can you tell me which logging?  Then I can test for this case.

> steps are reasonably common at first-boot.  The size of the step
> depends upon how good your TOY/CMOS clock is.

RasPis do not have CMOS clocks.  So the startup step is huge.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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