https://github.com/cloudhut/kowl[......]

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tcp建连优化
1 tcp建连，降低客户端超时时间
net.ipv4.tcp_syn_retries = 6
2 tcp建连，服务端避免syn攻击
netstat -s | grep "SYNs to LISTEN" 1192450 SYNs to LISTEN sockets dropped
可以考虑增大syn队列
net.ipv4.tcp_max_syn_backlog = 1024
超过上述队列后，启用syn cookie
net.ipv4.tcp_syncookies =[......]

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