Clocks broken on Mac mini

Hal Murray hmurray at
Wed Feb 1 01:05:21 UTC 2017

>> 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 

> 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crystal or out of date firmware or...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.

>> 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.

These are my opinions.  I hate spam.

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