>    Running the cards in full-duplex gives very poor performance.
>    Below are two tests ran with netperf. One is a direct connection
>    with a cross-over (which gives full-duplex as above) and one
>    is through a hub witch forces the PHYs into half-duplex.
> 
> That's the standard symptom when one end is running in full-duplex 
> mode and the other is half-duplex. 

But even if I choose full-duplex on both ends I get the lousy performance.

/ Jonas