bbrplus内核编译教程

作者：老刘
发布时间： 2020-03-08
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分类：网络技术
标签：编译,BBR,bbrplus

编译bbrplus内核前需要做好准备工作

bbrplus编译环境准备

centos环境

yum install -y screen wget curl zip unzip tar rsync ncurses-devel make gcc bc bison flex elfutils-libelf-devel openssl-devel rpm-build git  python3 dwarves file-devel libarchive-devel

debian/ubuntu环境

apt install -y screen wget curl zip unzip tar rsync build-essential libncurses-dev flex bc bison openssl libssl-dev dkms libelf-dev libudev-dev libpci-dev libiberty-dev autoconf pkg-config fakeroot dpkg-dev kmod cpio git  python3 dwarves debhelper libarchive-dev

下载4.14版内核

bbrplus目前只适用于4.14内核,其他内核暂时无人修改

wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.174.tar.xz
tar xf linux-4.14.*.tar.xz

修改内核代码

`./include/net/inet_connection_sock.h` 136行修改以下数字激进参数88->112 11->14 [保守参数(88->104 11->13)]

  u64                       icsk_ca_priv[112 / sizeof(u64)];
#define ICSK_CA_PRIV_SIZE      (14 * sizeof(u64))

`./net/ipv4/tcp_output.c` 1834行修改

tcp_snd_wnd_test 函数大括号后}
换行添加

  EXPORT_SYMBOL(tcp_snd_wnd_test);

/* Trim TSO SKB to LEN bytes, put the remaining data into a new packet
 * which is put after SKB on the list.  It is very much like
 * tcp_fragment() except that it may make several kinds of assumptions
 * in order to speed up the splitting operation.  In particular, we
 * know that all the data is in scatter-gather pages, and that the
 * packet has never been sent out before (and thus is not cloned).
 */

`./net/ipv4/Makefile` 44行替换参数

obj-$(CONFIG_TCP_CONG_BBR) += tcp_bbrplus.o

下载tcp_bbrplus源码

请参考末尾源代码,自行修改内核bbr源码

wget -P ./net/ipv4/ https://raw.githubusercontent.com/cx9208/bbrplus/master/tcp_bbrplus.c

开启编译选项并开启编译bbr为模块

#make oldconfig  可以直接使用系统配置文件
make menuconfig

禁用签名调试及编译

scripts/config --disable MODULE_SIG
scripts/config --disable DEBUG_INFO

编译内核生成centos rpm或ubuntu deb包，注意如果使用make rpm-pkg则每次编译前会先clean，如果重复编译会很慢！

make binrpm-pkg
make bindeb-pkg

开启bbrplus

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbrplus" >> /etc/sysctl.conf
sysctl -p

魔改参数设置(可选)
./net/ipv4/tcp_bbrplus.c 或者 ./net/ipv4/tcp_bbr.c

134:  
static const int bbr_bw_rtts = CYCLE_LEN + 7;
136:  
static const u32 bbr_min_rtt_win_sec = 20;
152:  
static const int bbr_drain_gain = BBR_UNIT * 1200 / 2885;
164:  
BBR_UNIT * 3 / 2,   /* probe for more available bw */
BBR_UNIT * 3 / 4,   /* drain queue and/or yield bw to other flows */
BBR_UNIT * 9 / 8, BBR_UNIT * 9 / 8, BBR_UNIT * 9 / 8,   /* cruise at 1.0*bw to utilize pipe, */
BBR_UNIT * 9 / 8, BBR_UNIT * 9 / 8, BBR_UNIT * 9 / 8    /* without creating excess queue... */

来源:
https://www.hostloc.com/thread-652002-1-1.html
https://github.com/liberal-boy/tcp_tsunami
https://github.com/ylx2016/kernel/releases/download/4.14.166-bbrplus/linux-4.14.166bbrplus.zip