Article on Gigabit performance

http://www.enterprisenetworkingplanet.com/nethub/article.php/10950_3485486_2

net.core.wmem_max = 8388608

net.ipv4.tcp_window_scaling = 1

net.core.wmem_default = 65536

net.core.rmem_default = 65536

net.ipv4.tcp_mem = 98304 131072 196608

After testing, I went from:

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Server listening on TCP port 5001

TCP window size: 85.3 KByte (default)

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[ 4] local 192.168.1.14 port 5001 connected with 192.168.1.111 port 46281

[ ID] Interval Transfer Bandwidth

[ 4] 0.0-10.0 sec 776 MBytes 648 Mbits/sec

to

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Server listening on TCP port 5001

TCP window size: 85.3 KByte (default)

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[ 4] local 192.168.1.14 port 5001 connected with 192.168.1.111 port 42455

[ ID] Interval Transfer Bandwidth

[ 4] 0.0-30.0 sec 2.58 GBytes 737 Mbits/sec