## 本人在测试机上测试过，效果不错
fs.file-max = 6553600 net.ipv4.ip_local_port_range = 1024 65000 net.ipv4.tcp_max_orphans = 3276800 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_fin_timeout = 1 net.ipv4.tcp_keepalive_time = 30 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_max_tw_buckets = 65536 net.ipv4.tcp_sack = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_rmem = 4096 87380 4194304 net.ipv4.tcp_wmem = 4096 16384 4194304 kernel.core_uses_pid = 1 kernel.sem = 250 32000 100 128 net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.somaxconn = 262144 net.core.netdev_max_backlog = 262144
前面net.ipv4.tcp_max_tw_buckets是调为6000的，在做web压力测试时候，系统日志狂报：
kernel: TCP: time wait bucket table overflow
所以就直接改为65536了。
如果发现报：
error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key
error: "net.bridge.bridge-nf-call-iptables" is an unknown key
error: "net.bridge.bridge-nf-call-arptables" is an unknown key
只要加载bridge模块就可以了：
[root@node2 ]# modprobe bridge
[root@node2 ]# sysctl -p
原文：http://ldhqy.blog.51cto.com/2788106/1435760