Hi

I built a bridge with:
- Linux 2.2.6ac2
- Gigabyte Mainboard
- AMD K6/200
- 64MB RAM
- Adaptec Quartet (4x100baseT, 21140)
- 2GB-HD Quantum bigfoot
- Matrox Mystique 200

To test I used 4 Computers directly
connected with crossover-cable.
The Clients are same class of Computer
as above, but with Lantronix NIC (21140)
and running NT4SP4 (no comment on NT please.
That's what will be used on the clients
in the production eviroment...)

In general the bridge works, but when the
networkload increases, I get up to 100%
packet loss!!!

I used netperf to test and also just
filecopy. A 56MB file took 6 Minutes
while the same Operation on the same
Computers takes about 20s when they
are connected to a cheap Switch...

I tried several kernel-options:
- optimize as router not host
- fast-switching (with patched 8390.[c|h])
- forwarding between highspeed intefaces
- CPU is too slow too handle full bandwith
(but I never saw a load higher than 10%
monitoring using top)

I also tried all tests once with all
NICs set to full-duplex and once with
half-duplex.


I would be thankfull for any clues on this
matter (even a "forget it. Linux is not
usable as a bridge" would be helpfull, as
I could then spend my energy on evaluating
a Switch).

Bye
 dworz
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