Paul Koning writes:
>
> Victor> PCI is not wonderful, but it is far better than isa. Isa is
> Victor> simply slow and very poor at handling contention.
>
> One interesting thing about buses is that few if any have well-defined
> real time properties. Usually if you ask a bus designer about latency
> bounds you merely get a blank stare. They can talk marketing best
> case numbers all day, and perhaps even "typical" or "average" case
> numbers, but the notion that anyone might be interested in a worst
> case bounds seems to be foreign. If you push hard, you may get a
> number. Often, that number will come with units of milliseconds, not
> microseconds.
>
> I find it somewhat ironic to have people get into religious debates
> about the non-real-time nature of Ethernet when the underlying system
> buses aren't real time in the first place.
This isn't precisely relevant, but there may be some people in the real time
community who are not be familiar with IEEE1355:-
http://www.1355-association.org/
Adrian
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