[ntp:questions] nmea and initial large offset
Richard B. Gilbert
rgilbert88 at comcast.net
Sun May 9 12:13:45 UTC 2010
> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>> Rob wrote:
>>> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>>> Please feel free to design your own algorithms to deal with the "systems
>>>> not running 24h/day" and, while you're at it, deal with temperature
>>>> variations and support drift rates up to 5,000 PPM, etc, etc.
>>> I don't feel free to design those because I can anticipate that the
>>> changes will be rejected and will not go into the distribution version.
>> Of course they will not go into the distribution version. At least it
>> won't go into Dave Mills' distribution.
>> IF you can make it work across the full spectrum of NTPD usage it will
>> be distributed somehow and people will use it if they perceive that it
>> does, and does well, things that the official *Mills" distribution cannot!
> I don't understand why certain features cannot be available as configurable
> options, so that mr Mills can have his limited functionality version while
> the rest of the world enjoys the practical, working, featureset.
> For example, an option to tell ntpd that it should believe the reference
> clocks when they majority-vote that the correct time is very far from the
> OS time. Like -g but also for local reference clocks like GPS, e.g.
> via ntpshm.
> This should be possible. And it should not affect mr Mills' systems
> when he makes sure he does not enable that option, so they happily
> continue to run in January 1970 after a RTC power loss when he likes that
>> If Dave Mills says "It can't work!" I think the burden of proof that it
>> can and does work is on you.
> That is the problem. He keeps referring back to his books and the
> facts he has collected 20 years ago, and a changing environment is not
> part of his world.
Dave's math is beyond me but I'm willing to take it on faith. It works!
I suspect that faster convergence would carry a price such as large
If you can't stand it, roll your own! You may find that it's far more
difficult than you think!
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