Re: NTPsec reports excessive jitter from GPSD/KPPS SHM

[Gary E. Miller]

Yo Nick!

On Sun, 08 Mar 2020 01:49:00 +0000
"Nick Burkitt" <address@hidden> wrote:

> Thanks - does the order matter? I've been using

Not really.

> gpsd -n /dev/pps0 /dev/ttyACM4

That should be fine.  But I admit I never do it in that order.

> and seeing those large PPS jitter numbers in NTPsec
> NTPsec doesn't seem to be able to find SHM(1) at all

More likely gpsd is not finding it.  ntpshmmon will tell you.

> 
>       remote           refid      st t when poll reach   delay
> offset jitter
>   SHM(0)          .GPS.            0 l    8   64  377   0.0000
> -65.3223 1.4824
>   SHM(1)          .PPS.            0 l    -    8    0   0.0000
> 0.0000 0.0019

0 reach, so not good.  Not an ntpd problem.

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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