linux参数优化
时间：2010-08-02 来源：wizardzj
日常运维中，发现有些web server的time_wait数比较多，访问有些慢，看来是系统参数需要做些优化，以下参数，经过实践测试，发现还是挺有效的
在/etc/sysctl.conf 增加，然后sysctl -p
fs.aio-max-nr = 3145728
fs.file-max = 6815744
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_tw_recycle = 1 net.core.rmem_max = 16777216
net.core.rmem_default = 16777216
net.core.netdev_max_backlog = 262144
net.core.somaxconn = 262144
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2 然后执行 netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}' 明显看出time_wait减少了
fs.file-max = 6815744
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_tw_recycle = 1 net.core.rmem_max = 16777216
net.core.rmem_default = 16777216
net.core.netdev_max_backlog = 262144
net.core.somaxconn = 262144
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2 然后执行 netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}' 明显看出time_wait减少了
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