Confirmed on a Dell XPS M1710:

 iperf -c target -i5 -t30
------------------------------------------------------------
Client connecting to target TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.8 port 56104 connected with 192.168.1.6 port 5001
[  3]  0.0- 5.0 sec    784 KBytes  1.28 Mbits/sec
[  3]  5.0-10.0 sec  1.14 MBytes  1.91 Mbits/sec
[  3] 10.0-15.0 sec  1.30 MBytes  2.19 Mbits/sec
[  3] 15.0-20.0 sec  1.34 MBytes  2.25 Mbits/sec
[  3]  0.0-24.7 sec  5.47 MBytes  1.86 Mbits/sec

and now with the workaround (sudo iwpriv eth1 set_mode 4):
iperf -c target -i5 -t30
------------------------------------------------------------
Client connecting to target TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.8 port 46670 connected with 192.168.1.7 port 5001
[  3]  0.0- 5.0 sec  8.10 MBytes  13.6 Mbits/sec
[  3]  5.0-10.0 sec  6.69 MBytes  11.2 Mbits/sec
[  3] 10.0-15.0 sec  2.16 MBytes  3.62 Mbits/sec
[  3] 15.0-20.0 sec  2.38 MBytes  4.00 Mbits/sec
[  3] 20.0-25.0 sec  2.72 MBytes  4.56 Mbits/sec
[  3] 25.0-30.0 sec  2.42 MBytes  4.06 Mbits/sec
[  3]  0.0-30.1 sec  24.5 MBytes  6.81 Mbits/sec

Seems better. But what exactly does set_mode 4 do? Open the gates? ;-)

And does anybody know, how to confirm, if the firmware (which is located
at /lib/firmware/2.6.20-16-386/iwlwifi-3945.ucode and ipw3945.ucode) is
used by the kernel at all? There seems to be not hotplug mechanism for
firmware active, but I might be wrong...

So far thanks for the workaround!

-- 
ipw3945 Wifi connection is very slow
https://bugs.launchpad.net/bugs/103210
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