执行以下命令优化
sysctl kern.ipc.somaxconn=4096
sysctl kern.ipc.nmbclusters=200000
sysctl kern.ipc.nmbjumbop=100000
sysctl net.inet.ip.portrange.randomized=0
sysctl net.inet.tcp.fast_finwait2_recycle=1
sysctl kern.random.sys.harvest.ethernet=0
参考自
http://nginx.org/en/docs/freebsd_tuning.html
