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Re: ntpviz showing odd repeating offset for SHM(0) from gpsd


From: shouldbe q931
Subject: Re: ntpviz showing odd repeating offset for SHM(0) from gpsd
Date: Sat, 9 May 2020 12:10:24 +0100

so now it gets curiouser

As can be clearely seen, the flip flop offset has gone from SHM(0),

https://pasteboard.co/J7yTyFQ.png

However there is now different issue

https://pasteboard.co/J7yVa8A.png

Cheers

Arne


On Fri, May 8, 2020 at 10:41 PM shouldbe q931 <address@hidden> wrote:
>
> Hi Martin,
>
> On Fri, May 8, 2020 at 4:23 PM Martin Boissonneault
> <address@hidden> wrote:
> >
> > Hi Arne,
> >
> > My U-blox MAX-M8Q does the same. The message timing has that varying 
> > offset, but it has no real consequences as SHM1 is the one that carries the 
> > PPS. I would, however, recommend you apply an offset to keep the delay 
> > positive or it could mess the decoding.
> >
>
> Yes, I'm quite aware that it isn't an "issue" (-:
>
>
> > Otherwise, it's normal.
>
> I have a "few" uBlox receivers (including a MAX-M8Q on an Uputonics
> "hat") , and I have not seen this on any of the others, none of the
> other gpsd installs were on the same (exact) version.
>
> I've updated to git head, and the "flip flop" offset no longer appears
> to be happening.
>
> Cheers
>
> Arne
>
> >
> > Martin
> >
> > Martin Boissonneault
> > Sent from my phone
> >
> > > On May 8, 2020, at 07:00, shouldbe q931 <address@hidden> wrote:
> > >
> > > ´╗┐As a picture is allegedly worth a thousand words, I've included two 
> > > pictures
> > >
> > > daily view
> > > https://pasteboard.co/J7p9VU5.png
> > >
> > > weekly view
> > > https://pasteboard.co/J7paicZ.png
> > >
> > > As none of the other server offsets show this, I have presumed that
> > > the repeating offset is not happening on the ntpsec side.
> > >
> > > gpsd: 3.19-dev (revision 3.19-dev-2019-04-22T13:57:37.400598)
> > > ntpd ntpsec-1.1.3+ 2019-04-22T13:02:45Z (git rev 5b9324c)
> > >
> > > Running in a rPi raspbian stretch
> > > 4.19.66-v7+ #1253 SMP Thu Aug 15 11:49:46 BST 2019 armv7l GNU/Linux
> > >
> > > gpsd is started with
> > > /usr/local/sbin/gpsd -P /var/run/gpsd.pid -n  /dev/gpsd0
> > >
> > > UBX-MON-VER:
> > > swVersion 1.00 (59842)
> > > hwVersion 00070000
> > > extension: PROTVER 14.00
> > > extension: GPS;SBAS;GLO;QZSS
> > >
> > > Although the rPi also runs dump109-fa (an ADS-B receiver), I'm fairly
> > > sure that this is not related.
> > >
> > > Cheers
> > >
> > > Arne
> > >



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