PPS undersampling

Gary E. Miller gem at rellim.com
Tue Aug 23 23:43:32 UTC 2016

Yo Eric!

On Tue, 23 Aug 2016 19:32:55 -0400
"Eric S. Raymond" <esr at thyrsus.com> wrote:

> Hal Murray <hmurray at megapathdsl.net>:
> >                                                                We
> > should get rid of the current every-second timer unless some
> > refclock needs it. (battery power)  The PPS API has an optional
> > wait/wakeup option.  We should use that if available.  The timer
> > stuff also covers when to transmit a packet, but we should peek
> > ahead and set the timeout on the select for as long as possible.
> > But all that should wait until after TESTFRAME so we can test it.  
> Agreed.  This has been on my long-term to-do list for some time.

Sadly, PPS with the current algorithm should bump up to sampling every
one-half second.  Some even want 10 Hz or even 100 Hz.

Let us leave it on the long-term to-do list and not hash over it now.
The subject is complicated and contentious.  Way too many moving parts
in a core chunk of the code to touch without TESTFRAME.  I also expect
TESTFRAME will smoke out some of these issues and also have its own
different timer loop needs.

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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