Clocks broken on Mac mini

Gary E. Miller gem at
Wed Feb 1 02:26:17 UTC 2017

Yo Hal!

On Tue, 31 Jan 2017 17:05:21 -0800
Hal Murray <hmurray at> wrote:

> >> Looks like ntpd is happy now.  
> > And what was the magic incantation?  Can you reset and make ntpd
> > fail again?  
> Installing adjtimex.
> Aside from the command line, it's got a mode where tries to adjust
> the drift like ntpd does.  I think saves stuff on the disk so when
> you run it again it can see how far the clock has drifted.  I don't
> know how that interacts with ntpd.

I think adjtimex does not save anywhere but in kernel RAM.

> > We are not talking about most, we are talking about the outliers.  
> There are two types of outliers.  One is hardware, a specific box has
> a weird crystal or out of date firmware or...  The other is
> systematic.  Someplace in the long chain of hardware, documentation,
> firmware, kernel, libraries, and ntpd isn't working right.  I think
> this one is worth understanding.  If/when we understand it, we can
> try to come up with a reasonable work-around.


> > Not tried chronyd yet?  
> I have it running on an OpenBSD system.  It seems to wander off
> occasionally. I haven't investigated.

Not tried chronyd on this problem Mac and OS then?  Would be nice to
know of chronyd suffered the same problem on ntpd on this problem host
and OS.

> >> I think it's reasonable for ntpd to expect the kernel clock to be
> >> reasonably close.  
> > I don't.   
> We should probably agree to disagree.

I'll have to prefer my personal experience to your expectations on

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at  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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