This is still an issue with recent kernels. I tested Quantal and one of the Saucy dailies (3.10) on my laptop with an Intel 6205 card, both had about half the throughput (~50Mb/s vs ~100Mb/s) that it gets under Windows, occasional stalls (that don't happen under Windows), and huge "tx excessive retries" numbers when, say, wgetting from kernel.org.
This is still an issue with recent kernels. I tested Quantal and one of the Saucy dailies (3.10) on my laptop with an Intel 6205 card, both had about half the throughput (~50Mb/s vs ~100Mb/s) that it gets under Windows, occasional stalls (that don't happen under Windows), and huge "tx excessive retries" numbers when, say, wgetting from kernel.org.