FreeBSD Tuning
# FreeBSD 3.4 defaults are 524288 max, 16384 default
/sbin/sysctl -w kern.ipc.maxsockbuf=1048576
/sbin/sysctl -w net.inet.tcp.sendspace=32768
/sbin/sysctl -w net.inet.tcp.recvspace=32768
Enabling High Performance Data Transfers on Hosts:
http://www.psc.edu/networking/perf_tune.html