Emilio,

> When I only use one wireless cards, the output of the top command is 
> very similar to that obtained with two wireless card
> Specifically, the /%si/ field is about /50%/, and the total CPU usage is 
> about /100%.
>
>   
That would mean the CPU is 100% busy servicing a single wireless card.
If you distribute that CPU performance to 2 cards, you'd get pretty much 
half the throughput. Which is what you observe.

It all makes sense: you are CPU limited.

madwifi could simple cause the CPU to be busy. Finding out what the real 
cause is, is going to be
difficult though. I'd replace the wireless cards with another type 
(non-Atheros) if possible
and that new card is supported. Or use a computer with a faster CPU (5501).
> Do you think that this is a madwifi problem?
>   
Id' say the problem is one or a combination of:
- CPU performance/PCI bus performance
- wireless card hardware/driver

To find out what it is, the easiest way is to replace one by one and see 
what happens. Since you have another computer (the Athlon one), check 
with top on that one: if CPU usage with one card is (e.g.) 10% and with 
2 it's increasing to 20%, then all looks well except the Soekris is too 
slow.

Harald

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