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Re: [gpsd-dev] Draft Time Service HOWTO is beginning to approach final f

From: Beat Bolli
Subject: Re: [gpsd-dev] Draft Time Service HOWTO is beginning to approach final form
Date: Wed, 23 Oct 2013 23:49:54 +0200
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On 23.10.13 23:04, Eric S. Raymond wrote:
> I've just reread the whole draft. There are still a couple of active
> discussion threads going on, and I have no doubt there will be much
> t-crossing and i-dotting still, but it it is beginning to look close
> to content-complete.
> Chris Kuethe, if you're listening, now would be a good time for you to
> work on cleaning out as many Linux-centrisms as you can.
> Some minor issues from the draft:
> TODO: There's an open issue about how you know you're stabilized
> enough to compute a correct offset.
> This is an issue for both nptd and chrony.  Is it sufficient to say,
> for a GPS, that we need to wait until (a) we are sure the device has 
> been powered up and has skyview long enough to download an ephemeris,
> and (b) it's been getting continuous fixes for a few minutes?  Or are
> there other considerations involved?
> Gary has said: "I would also add the comments in ntpshm.c starting on
> lines 78 and 865."
> I've merged the first.  The second is mostly arcana about PPS pulse
> shape which I don't think belongs in the HOWTO.  But I've included
> the information about GPSD waiting for a couple of fixes before it
> tries to ship PPS.

The section that explains the differences between root vs. non-root
operation and devices on the command line vs. hotplug needs to be
adjusted now that the root privileges are dropped after setting up the
SHM segments and raising the PPS thread priority (commit

I'm going to send a few minor fixes in a few minutes.

mail: echo '<address@hidden>' | tr -d '[A-S]'
pgp: 0x506A903A; 49D5 794A EA77 F907 764F  D89E 304B 93CF 506A 903A
icbm: 47.0452 N, 7.2715 E

"It takes love over gold, and mind over matter" -- Dire Straits

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