ntploggps affects timing stats?

Gary E. Miller gem at rellim.com
Thu Jun 13 00:00:19 UTC 2019

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?

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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