[Soekris] net4521 and 802.11a performance

[krishna]

Hi,
     I have some net4521 boards. I am investigating their use as  
802.11a relay devices. In some preliminary performance tests using  
IPerf, I am getting not getting more than 10Mbits/sec throughput from  
the soekris device to an AP. The radio on the soekris is a Atheros  
5212 cardbus radio. The radio on the AP is also of the same type. To  
test the throughput I am pumping traffic through the soekris radio at  
54M with packet size set to 1470 bytes in order to saturate the link  
to the AP. In contrast, a laptop using the same radio that is co- 
located with the soekris is able to get roughly twice the throughput  
to the same AP. I tested the throughput on all 802.11a channels and  
the result is the same. Distance between the AP and the soekris is  
not an issue. They are roughly 5 meters away from each other.
     My question is: has anyone on this list performed similar tests  
on the net4521? I am curious to know the results. I did go through  
the mailing list and saw some performance numbers but none that  
compare the soekris  802.11a peak performance with a higher powered  
device.

Thanks in advance,
-Krishna