转：http://blog.chinaunix.net/uid-9395696-id-3432841.html

modprobe ip_conntrack
echo "modprobe ip_conntrack" >> /etc/rc.local
sysctl.conf修改
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.ip_conntrack_max =655360
net.core.netdev_max_backlog = 8192
net.core.somaxconn = 4096

php.ini修改
default_socket_timeout = 120
memory_limit = 4096M

php-fpm修改
listen.backlog = 3072
pm.max_requests = 102400

参数根据自己服务器的性能调整