Very poor network performance gigabit-lan

gef

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Dec 31, 2011
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hello community,

i have a gigabit-lan but my the network performance is (dependent from the send-direction) very poor.

1 pc with win xp, 1 with ubuntu


i measured with iperf, here are the results:

ubuntu as server (iperf -s)
win xp to ubuntu (iperf -c): bandwith about 50 Mbits / sec

ubuntu as client (iperf -c)
ubuntu to win xp (iperf -s): bandwith about 644 Mbits / sec

question: why is bandwith from win xp to ubuntu so poor?

thanks for your resonses.

regards
gef