I am also experiencing this bug with iwl3945 on my amd64 hardy system.

I've just tried to recompile the ubuntu kernel sources with the in-kernel 
iwlwifi enabled and that works a whole lot better. With the version in l-u-m i 
get about 100KB/s download speed with my computer about half a meter from my 
AP, and 500ms+ latency when downloading something.
With the in-kernel version i get 1300KB/s and 100ms latency at that speed.
The only things i changed in the kernel config was to enable the iwlwifi and 
the in-kernel alsa driver for my soundcard (for convenience).

I think that if this bug is not fixed soon, maybe Hardy should be released with 
the in-kernel version of iwl, at least for the 3945, because right now it's 
pretty unusable.
I use WPA2 on my wlan, but I've seen the same problem on unencrypted networks.

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major throughput difference (between upload and download) when using iwl3945
https://bugs.launchpad.net/bugs/176271
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