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Re: NTPsec reports excessive jitter from GPSD/KPPS SHM


From: Gary E. Miller
Subject: Re: NTPsec reports excessive jitter from GPSD/KPPS SHM
Date: Tue, 10 Mar 2020 13:56:25 -0700

Yo Nick!

On Tue, 10 Mar 2020 20:44:30 +0000
"Nick Burkitt" <address@hidden> wrote:

> So moving the GPS to the end of the file AND keeping noselect is 
> redundant?

Depends.  In my case, I set a large fudge to the GPS time so that
ntpd will only select GPS time in desperation.  YMMV.

> For my application, I'll always prefer GPS time if it's available, so 
> removing noselect and moving it to the end is what I want?

No, you will always prefer PPS time if available, then local servers,
then regional servers, then pool servers, and last resort your GPS time.

GPS time often varies by 100's of milli seconds.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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