udp performance on Windows XP


Hi, has anyone ever met such problem that, on Windows XP, the UDP sending rate of Iperf is very slow?

I have 2 machines connected by 1GigE link. Both have 2 2.4G Xeon CPU, and one is running Linux, the other is running XP. When I test UDP performance between these 2 machines, the throughput from Linux to XP is very good, but the reverse direction can only reach about 50Mbps. The TCP throughputs are both very well on two directions.

Any ideas?

Thanks a lot,
Gu


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