Nathaniel Smith published a set of patches for the Linux iwl3945 driver. He reports about two orders of magnitude improvement of his RTT under load, with no bandwidth performance difference. Latencies went from several seconds latency in his simple tests, to of order 30ms under load.
Good stuff, Nathaniel! Even better is that this may be usable on my own laptop, though I have to hunt a bit to see.🙂.