Client to OS X Server uploads slow

Tom Kroening writes: "I've run into what appears to be a bug with Mac OS X Server. After setting up windows file sharing I decided to test it with a 20MB file. It took about 2 or 3 seconds to download off of the server. When I uploaded it back it took almost two minutes! I've tried this using two different switches and also with a crossover cable: same result. I have seen other reports of this on the Web."