(转)Linux 网络大流量传输优化方法

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# 增加TCP读写缓冲区范围
echo "net.ipv4.tcp_rmem = 4096 87380 16777216" >> /etc/sysctl.conf
echo "net.ipv4.tcp_wmem = 4096 65536 16777216" >> /etc/sysctl.conf

# 增加最大缓冲区大小
echo "net.core.rmem_max = 16777216" >> /etc/sysctl.conf
echo "net.core.wmem_max = 16777216" >> /etc/sysctl.conf

# 增加默认缓冲区大小
echo "net.core.rmem_default = 1048576" >> /etc/sysctl.conf
echo "net.core.wmem_default = 1048576" >> /etc/sysctl.conf

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# 增加最大连接数
echo "net.core.somaxconn = 32768" >> /etc/sysctl.conf

# 增加等待连接队列大小
echo "net.ipv4.tcp_max_syn_backlog = 8192" >> /etc/sysctl.conf

# 启用TCP快速打开
echo "net.ipv4.tcp_fastopen = 3" >> /etc/sysctl.conf

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# 查看可用算法
sysctl net.ipv4.tcp_available_congestion_control

# 设置拥塞控制算法(推荐使用bbr或cubic)
echo "net.ipv4.tcp_congestion_control = bbr" >> /etc/sysctl.conf

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# 增加文件描述符限制
echo "fs.file-max = 1000000" >> /etc/sysctl.conf
ulimit -n 1000000

# 使用更高效的文件传输工具(如bbcp、rsync with --partial等)

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# 启用时间戳
echo "net.ipv4.tcp_timestamps = 1" >> /etc/sysctl.conf

# 启用选择性确认
echo "net.ipv4.tcp_sack = 1" >> /etc/sysctl.conf

# 调整keepalive时间
echo "net.ipv4.tcp_keepalive_time = 300" >> /etc/sysctl.conf
echo "net.ipv4.tcp_keepalive_probes = 5" >> /etc/sysctl.conf
echo "net.ipv4.tcp_keepalive_intvl = 15" >> /etc/sysctl.conf

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# 查看网络接口的中断
cat /proc/interrupts | grep eth

# 设置中断亲和性(根据CPU核心数调整)
# 例如将eth0的中断绑定到CPU0
echo 1 > /proc/irq/[中断号]/smp_affinity

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ifconfig eth0 mtu 9000

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# 使用axel多线程下载工具
axel -n 10 http://example.com/largefile.iso

# 使用parallel-rsync进行并行rsync传输

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# 应用所有sysctl设置
sysctl -p

# 验证当前TCP参数
sysctl -a | grep tcp

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iftop -n -i eth0
nload eth0