[MAC] Tweak Network Bandwidth in MAC OSX Leopard

Download and Install Broadband Tuner 1.0.

The system parameters are sysctl variables that are set as follows:
net.inet.tcp.sendspace: 131072
net.inet.tcp.recvspace: 358400
kern.ipc.maxsockbuf: 512000

如果速度還是不滿意，也可以自己手動修改/etc/sysctl.conf
或是

sudo sysctl -w net.inet.tcp.recvspace=230000
sudo sysctl -w net.inet.tcp.sendspace=230000

成果測試

網路環境：Biglobe with B-Flet's VDSL UP/DL:100Mbits/100Mbits
原本連到NCTU的速度是 UP/DL:100Kbytes/20Kbytes。
修改之後，可以變成 UP/DL:1Mbytes/1Mbytes