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安装编译环境

yum install -y ncurses-devel make gcc bc bison flex elfutils-libelf-devel openssl-devel rpm-build
yum install -y dpkg-dev #生成deb包依赖

ubuntu下：

apt install build-essential libncurses-dev flex bison openssl libssl-dev dkms libelf-dev libudev-dev libpci-dev libiberty-dev autoconf

下载4.14版内核：

wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.158.tar.xz
tar xf linux-4.14.158.tar.xz

patch:

diff -urN aa/include/net/inet_connection_sock.h bb/include/net/inet_connection_sock.h
--- aa/include/net/inet_connection_sock.h       2019-12-14 17:07:48.190502969 +0800
+++ bb/include/net/inet_connection_sock.h       2019-12-14 17:08:06.373215456 +0800
@@ -136,8 +136,8 @@
        } icsk_mtup;
        u32                       icsk_user_timeout;
 
-       u64                       icsk_ca_priv[88 / sizeof(u64)];
-#define ICSK_CA_PRIV_SIZE      (11 * sizeof(u64))
+       u64                       icsk_ca_priv[112 / sizeof(u64)];
+#define ICSK_CA_PRIV_SIZE      (14 * sizeof(u64))
 };
 
 #define ICSK_TIME_RETRANS      1       /* Retransmit timer */
diff -urN aa/net/ipv4/Makefile bb/net/ipv4/Makefile
--- aa/net/ipv4/Makefile        2019-12-14 17:09:40.204731772 +0800
+++ bb/net/ipv4/Makefile        2019-12-14 17:09:47.147621995 +0800
@@ -44,7 +44,7 @@
 obj-$(CONFIG_INET_UDP_DIAG) += udp_diag.o
 obj-$(CONFIG_INET_RAW_DIAG) += raw_diag.o
 obj-$(CONFIG_NET_TCPPROBE) += tcp_probe.o
-obj-$(CONFIG_TCP_CONG_BBR) += tcp_bbr.o
+obj-$(CONFIG_TCP_CONG_BBR) += tcp_bbrplus.o
 obj-$(CONFIG_TCP_CONG_BIC) += tcp_bic.o
 obj-$(CONFIG_TCP_CONG_CDG) += tcp_cdg.o
 obj-$(CONFIG_TCP_CONG_CUBIC) += tcp_cubic.o
diff -urN aa/net/ipv4/tcp_output.c bb/net/ipv4/tcp_output.c
--- aa/net/ipv4/tcp_output.c    2019-12-14 17:08:48.488549518 +0800
+++ bb/net/ipv4/tcp_output.c    2019-12-14 17:08:55.061445594 +0800
@@ -1834,6 +1834,7 @@
 
        return !after(end_seq, tcp_wnd_end(tp));
 }
+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

下载tcp_bbrplus源码：

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

打开编译选项并开启编译bbr为模块：

make menuconfig

禁用签名调试：

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 -j4
make bindeb-pkg -j4 

开启bbrplus：

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

ubuntu系统禁止更新内核：

for pkg in $(dpkg -l|awk '/linux-(generic|headers|image|libc|modules)/{print $2}');do 
echo $pkg; 
apt-mark hold $pkg;
done

20210102更新：
由于4.14内核过于老旧，新系统使用会出现兼容性问题，且新内核bbr也一直在更新优化，建议下载安装最新的内核使用。
centos安装最新内核方法：https://www.haiyun.me/archives/1139.html
ubuntu安装最新内核方法：https://www.haiyun.me/archives/1344.html
查看指定内核版本的bbr更新状态：
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/net/ipv4/tcp_bbr.c?h=v5.10.4
查看ubuntu内核源码bbr更新状态：
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/log/net/ipv4/tcp_bbr.c?h=Ubuntu-5.4.0-59.65
参考：
https://github.com/cx9208/bbrplus
https://blog.csdn.net/dog250/article/details/80629551