Re: [rtl] IP useage from rtlinux, reply to Richard Teltz

[Thomas Wuensche <wuensche@ems-wuensche.com>]

Paul Koning wrote:

Snip

> 2. Many networks INCLUDING Ethernet have bounded access latency: the
> delay from arrival at head of queue to transmission is bounded.  (For
> Ethernet, the bound is 16 worst-case backoffs, which is a few hundred
> milliseconds.  For FDDI, it's TTRT times station count, which can be
> many seconds.  Don't know what it is for token ring other than that
> it's a long time.)

Why do you think Ethernet has a bounded access latency? Who can guarantee
that a paket is sent within a given maximum amount of time on Ethernet?
I ask that for original Ethernet (10Base2), not the switched full-duplex
flavours.

BTW, we had this discussion on an automation mailing list, with a lot of
different opinions and contrary arguments and statements. I'd be interested
to get more information on backoff probability (should depend on segment 
length, for example) and backoff time.

Thomas Wuensche
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