On 17/08/2013 18:31, Magnus Danielson wrote:
[]
What might be useful is to store the corrected 1024 weeks offsets, since
if the NTPD is restarted, those corrections can be applied up-front and
then can these corrected values be used to provide good basis for
majority decisions about "correct time". When a particular receiver
flips, then it is the only one (possibly a few of them changing at the
same time) which shift by 1024 weeks, and then it is easy to use the
1024-week assumption as a priori knowledge to correct them. When you
wake up the flipped receivers may form a majority, which would be
unfortunate, as we already know they have flipped, but we forgot it in
the re-start process. Doing this, the system integrity can be maintained
throughout.
Cheers,
Magnus
It will be interesting to see what folks come up with for the patch. I
must admit to feeling that a fault in GPS receivers should /not/ have to
be fixed in NTP, but I accept that's likely to be the best solution.
It should certainly be an option that has to be specifically enabled
(command-line switch or fudge command), and one which has no impact
otherwise on the reliability and maintainability of NTP.
--
Cheers,
David
Web: http://www.satsignal.eu
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