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--- linux:bbr [2018/01/08 13:29] – percy
+++ linux:bbr [2018/01/08 14:40] (current) – [BBR] percy
@@ Line 1: / Line 1: @@
 ====== BBR ======
-BBR is the optimization for the tcp, and it can increase the network speed significant. So it's the same as kcptun.
+BBR is the optimization for the tcp, and it can increase the network speed significant. So it's the same as [[linux:kcptun|kcptun]].
 ===== BBR on Raspberry Pi =====
@@ Line 10: / Line 10: @@
 ==== Enable bbr ====
+  sysctl net.core.default_qdisc=fq
+  sysctl net.ipv4.tcp_congestion_control=bbr
 <code BASH>
 pi@raspberrypi:~ $  sudo sysctl net.ipv4.tcp_congestion_control=bbr
@@ Line 32: / Line 35: @@
 Or
   sudo apt-get install linux-image-4.10.0-42-generic linux-headers-4.10.0-42-generic
+Actuall after install the above kernel, it doesn't support BBR, and the working kernel is following one, you need manual download and install it
+  cd kernel4.9/
+  wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9/linux-image-4.9.0-040900-generic_4.9.0-040900.201612111631_amd64.deb
+  sudo dpkg -i linux-image-4.9.0-040900-generic_4.9.0-040900.201612111631_amd64.deb
 Update the grub
   sudo vim /etc/default/grub
@@ Line 38: / Line 47: @@
   GRUB_DISABLE_SUBMENU = Y
-  export GRUB_CONFIG =`sudo find / boot -name“grub.cfg”`
+  export GRUB_CONFIG=`sudo find /boot -name "grub.cfg"`
   sudo update-grub
@@ Line 47: / Line 56: @@
 Now you can reoot the VPS
+==== Some tips ====
+<code>
+uname -r
+＃查看内核版本，含有4.9.0就表示OK了
+＃------------
+sysctl net.ipv4.tcp_available_congestion_control
+＃返回值一般为：
+＃net.ipv4.tcp_available_congestion_control = bbr cubic reno
+＃------------
+sysctl net.ipv4.tcp_congestion_control
+＃返回值一般为：
+＃net.ipv4.tcp_congestion_control = bbr
+＃------------
+sysctl net.core.default_qdisc
+＃返回值一般为：
+＃net.core.default_qdisc = fq
+＃------------
+lsmod | grep bbr
+＃返回值有tcp_bbr模块即说明bbr已启动。
+</code>
+==== Refer ====
+  - https://www.nmbhost.com/archives/1594
+  - https://blog.chenjia.me/articles/161229-000832.html
+  - https://www.digitalocean.com/community/tutorials/how-to-update-a-digitalocean-server-s-kernel