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Re: [gpsd-dev] PPS and privilege-dropping

From: Greg Troxel
Subject: Re: [gpsd-dev] PPS and privilege-dropping
Date: Fri, 18 Oct 2013 19:42:06 -0400
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/23.4 (berkeley-unix)

"Gary E. Miller" <address@hidden> writes:

>> That's not enough by itself.  You and other time nuts have implicit
>> knowledge, expressed in jargon like "chimers" which isn't actually
>> defined anywhere (I googled to check).  We need to get that knowledge
>> onto (virtual) paper.
> Odd, I can't find a trvial reference to that either.  A chimer is just
> an time source you are using.  Likely remote in some way.

This is Dave Mills' jargon.  Basically:

  truechimer: a computer, usually remote, that speaks NTP, and whose
  clock is basically right.  Note that basically right allows some slop
  for it being a bit off due to errors, but not wildly off

  falseticker: a computer, usually remote, that speaks NTP, and whose
  time is way off base.

The basic point is that in the outlier detection phase, falsetickers are
outvoted and removed from further consideration.

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