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Re: [gpsd-dev] double PPS

From: Gary E. Miller
Subject: Re: [gpsd-dev] double PPS
Date: Tue, 29 Oct 2013 21:46:23 -0700

Yo Eric!

On Tue, 29 Oct 2013 22:52:24 -0400
"Eric S. Raymond" <address@hidden> wrote:

> Gary E. Miller <address@hidden>:
> > There used to be a lockout on that.  Any idea what happend?
> I see you fixed it.


> Meanwhile, I found a reversion that makes the SiRF-III problem
> go away, but at a cost - it may bring back problems with TCP/IP
> and UDP sources. Really fixing this is at the top of my list now.


> In descending priority order, my other items are:
> * Check if gpsd is eating near 100% of CPU (Greg Troxel's report)
>   and if so find out why and fix it.  My suspicion naturally falls
>   on the PPS monitor loop.

Yeah, weird.  UNable to duplicate here.

> * Actually do a complete runthrough of the Time Service HOWTO
> instructions.

Which is why I have been working on chrony, so I can get that part
of the HOWTO cleaned up.  As always, getting the time server to prefer
PPS over NMEA time has been a chore.  Also have the priveledge dropping
problems again.  I prefer to get the code to work, then work on the doc.

> * GR601-W causes annoying flicker in gpsmon.  I think this is related
>   to the code rapidly flapping between u-blox and NMEA modes, which it
>   shouldn't be doing.

I never use gpsmon, but now that you mention it, that is ugly.
> * I want PPS events to be visible in gpsmon. This is half the reason
> I pulled the ntpshm and ppsthread stuff appart, so gpsmon can use the 
>   latter without involving the former.  The other reason was code
> hygiene; as it was that code was entirely too big and tangled a lump.

Well, from my perspective it is now a lot harder to work on.  I gotta
flip back an forth between yet more files.  Splitting it up into 3 files
is not making it less tangled...

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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