ntploggps affects timing stats?

[Gary E. Miller]

Yo Paul!

On Wed, 12 Jun 2019 16:53:42 -0700
Paul Theodoropoulos <paul at anastrophe.com> wrote:

> Just ran into this bizarro event, which makes no sense to me.
> 
> Logged into my ntp server, noticed that loggps had stopped running a 
> couple of days prior.
> 
> Started it up - at 15:21 localtime, 22:21 UTC.
> 
> Then when my hourly stats were generated, I'm presented with this
> (and all the other relevant stats show a similar improvement):
> 
> https://i.imgur.com/hQ2CG4X.png
> 
> What am I missing here? Why would I get an approx 2ppb improvement in 
> local frequency jitter by starting loggps? Time jitter shows similar, 
> frequency offset similar, etc. Do the GPS logs factor into the other 
> statistics generated, in some way? I can't imagine they would -
> jitter is jitter, the whole world 'round...right?

Weird.  Maybe ntploggps is keeping your CPU from doing a microsleep
or cutting the clock speed?  Maybe it keeps gpsd from getting swapped
out or?

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  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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