On Sun, 25 Sep 2005 20:03:54 -0700, Jeff Liebermann
<jeffl@comix.santa-cruz.ca.us> wrote:

>>Setup 2: 9 Mbps (max 11Mbps, very high variance)
>
>That's wireless client to client with no WDS. That should be almost
>exactly half of of the above 25Mbits/sec thruput. The loss is
>probably due to interference between the two wireless clients, which
>cannot legally be operated synchronously and only one transmitter may
>be on at a time. You might wanna try to enable CTS/RTS flow control
>in the 3com router. That will help with some of the collisions. The
>thruput will be somewhat reduced but so will the collisions.

There's another possible reason for the dismal thruput performance.
Most wireless clients treat the presence of other clients as
interference. I find it difficult to maintain a 54Mbit/sec connection
in the same room as other active wireless clients. In this benchmark
arrangement, you are guaranteed to have both wireless clients
simultaneously active, so the these clients may decide that there's
some interference. The usual reaction is to slow down the connection
to improve reliability. That may also explain the slowdown and
erratic speed variations.


--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558