Kernel slew/PLL (from IRC)

Gary E. Miller gem at
Wed Sep 28 22:35:02 UTC 2016

Yo Hal!

On Wed, 28 Sep 2016 15:19:38 -0700
Hal Murray <hmurray at> wrote:

> gem at said:
> >> There is a PLL kernel option to track a PPS.  It's not compiled
> >> into most Linux kernels.  
> > Thus a distraction to our discussion.   
> I think it's key to why this discussion is causing so much confusion.
> When I say "kernel PLL", that's what I'm referring to.  See my recent
> message to Eric about TESTFRAME.

There are not two separate kernel PLLs.  There is one to discipline
the time (see adjtimx(2) ).  You are confusing that with the RFC 2783
PPS input which can help discipline that one and only PLL.

You are confusing the two.

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