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--- linux:bbr [2018/01/08 12:33] – 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 20: / Line 23: @@
 net.ipv4.tcp_congestion_control = bbr
 </code>
+==== DigitalOcean enable BBR ====
+Refer
+  - https://www.digitalocean.com/community/tutorials/how-to-update-a-digitalocean-server-s-kernel
+Install the grub loader in the console panel, first you need power off, then after install the grub loader, then power on.
+Install the new kernel, you can find the kernel what you want
+  apt-cache search --names-only linux-image
+   sudo apt-get install linux-image-4.11.0-13-generic linux-headers-4.11.0-13-generic
+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
+Add the line:
+  GRUB_DISABLE_SUBMENU = Y
+  export GRUB_CONFIG=`sudo find /boot -name "grub.cfg"`
+  sudo update-grub
+Now you find all the kernel
+  grep 'menuentry ' $GRUB_CONFIG | cut -f 2 -d "'" | nl -v 0
+And you need update /etc/default/grub, and set update the index to the one your want
+  GRUB_DEFAULT=0
+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