shadowsocks的Tcp连接优化

增大打开的文件描述符

vi /etc/security/limits.conf

添加这两行

* soft nofile 51200
* hard nofile 51200

然后, 在启动shadowsocks服务器之前,先设置ulimit

ulimit -n 51200

打开内核参数

• 快速重用端口和连接
• 队列和缓冲区增加到最大
• 为Tcp连接的延迟和高吞吐量选择最优算法

/etc/sysctl.conf

fs.file-max = 51200

net.core.rmem_max = 67108864
net.core.wmem_max = 67108864
net.core.netdev_max_backlog = 250000
net.core.somaxconn = 4096

net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.ip_local_port_range = 10000 65000
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_fastopen = 3
net.ipv4.tcp_mem = 25600 51200 102400
net.ipv4.tcp_rmem = 4096 87380 67108864
net.ipv4.tcp_wmem = 4096 65536 67108864
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_congestion_control = hybla

重载配置文件

sysctl -p

我们的Shadowsocks