官网中关于如何在EC2中开启BBR的说明。Amazon Linux AMI 2017.09 Release Notes
开启方法 开启方法摘录如下:
The Kernel has been updated to latest 4.9.y stable tree, new ENA driver 1.3.0 as well as support for TCP Bottleneck Bandwidth and RTT (BBR) which improve network performance.
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$ sudo modprobe tcp_bbr
$ sudo modprobe sch_fq
$ sudo sysctl -w net.ipv4.tcp_congestion_control=bbr
Persistent configuration should look like:
$ sudo su -
# cat <<EOF>> /etc/sysconfig/modules/tcpcong.modules
>#!/bin/bash
> exec /sbin/modprobe tcp_bbr >/dev/null 2>&1
> exec /sbin/modprobe sch_fq >/dev/null 2>&1
> EOF
# chmod 755 /etc/sysconfig/modules/tcpcong.modules
# echo "net.ipv4.tcp_congestion_control = bbr" >> /etc/sysctl.d/00-tcpcong.conf
额外的命令 Amazon Linux AMI中查看系统中拥塞控制的命令如下
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# 查看系统支持的拥塞控制方法
$ sysctl net.ipv4.tcp_available_congestion_control
net.ipv4.tcp_available_congestion_control = bbr cubic reno
$
# 查看当前使用的拥塞控制方法
$ sysctl net.ipv4.tcp_congestion_control
net.ipv4.tcp_congestion_control = bbr
$
其中
用命令lsmod | grep bbr查看bbr是否已经启动1
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$ lsmod | grep bbr
tcp_bbr 20480 15
$
Reference