[Soekris] Net 4801 performance

[schule]

Hi,

I recently changed my switch, and now I´m getting about
2.3MB/sec whats almost good.
I already changed the wires and winXp an my Freebsd laptop
could transfer data with ~11MB/sec on the same switch, so I have no clue  
what´s
the matter with the old switch..

But one problem remains.

When is start netio or iperf on the soekris and do a
"netio localhost", I get about 8 MB/sec, and when I start
with "netio 192.168.0.11"(it localhost address) I get only ~2.3 MB/sec.
That´s what top says when I do

localhost
CPU states:  2.3% user,  0.0% nice, 72.5% system, 25.2% interrupt,  0.0%  
idle

192.168.0.11
CPU states:  1.2% user,  0.0% nice, 46.3% system, 52.5% interrupt,  0.0%  
idle

As you can see, the interrupt load is more than doubled when I use the Ip  
address, and
I´ve no idea why.

What could that be?



cheers