Linux下网络堆栈配置

可以修改/etc/sysctl.conf进行网络堆栈配置，进行网络性能优化

# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
# controls whether the system should reboot if it detects a hung task
# 1 means reboot after hung_task_timeout_secs after a hung task is detected
# default value is 0
kernel.hung_task_panic = 0
# controls how long to reboot after a hung task is detected
# default is 600 seconds.
# note: this only matters if kernel.hung_task_panic=1
kernel.hung_task_timeout_secs = 600
net.ipv4.tcp_timestamps=0
net.ipv4.tcp_sack=1
net.core.netdev_max_backlog=250000
net.core.rmem_max=4194304
net.core.wmem_max=4194304
net.core.rmem_default=4194304
net.core.wmem_default=4194304
net.ipv4.tcp_rmem="4096 65536 4194304"
net.ipv4.tcp_wmem="4096 65536 4194304"
net.ipv4.tcp_low_latency=1

参数含义：

tcp_timestamps：时间戳，为0禁用时间戳
tcp_sack:选择应答，为1表示开启
netdev_max_backlog:当网卡接收数据包的速度大于内核处理的速度时，会有一个队列保存这些数据包，该参数表示该队列的最大值
rmem_max:内核套接字接收缓存区最大的大小
wmem_max:内核套接字发送缓存区最大大小
rmem_default:内核套接字接收缓存区默认大小
wmem_default:内核套接字发送缓存区默认大小
tcp_rmem:TCP接受缓存（用于TCP接收滑动窗口）的最小值，默认值，最大值
tcp_wmem:TCP发送缓存（用于TCP发送滑动窗口）的最小值，默认值，最大值
tcp_low_latency:TCP响应延迟，0为禁用低延迟，这样配置后能够获取更高的吞吐量