Pivoting

[Gary E. Miller]

Yo Hal!

On Fri, 21 Apr 2017 23:22:33 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:

> One is that there is a tradeoff between building in a long lifetime
> and catching problems during a normal lifetime.  I'm not sure which
> is more likely.  Consider what happens if a server gets fired up with
> a broken clock and starts answering all requests with 1970.  Do you
> want to reject that, or pivot it to 2036?

I'd have ntpd reject any time prior to EPOCH.

>   Allow the user to specify the pivot time and/or life time, either
> at build time or at run time or both.

EPOCH is used for NMEA, so that is covered at build time.

I could see adding an option to specify the EPOCH at run time too.

> How long have computers been used in cars?  When did they start using 
> software complicated enough to support a system time-of-day clock?
> What's their track record for long lifetime bugs?

As mentioend earlier, PDP-8s still run.  That is late 1960's.  Call it
50 years.


RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

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    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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