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

[Beat Bolli]

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
247c5825172137f337a79a1ff2f73b4af2899f66).

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

Beat
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