linode turns on BBR acceleration

TCP BBR acceleration can make your vps run as full bandwidth as possible and minimize data transmission queuing. It is an accelerator comparable to Ruisu. This module has been added to the latest linux kernel4.9 kernel, and linode The kernel 4.9 kernel is also supported. So we only need to enable bbr acceleration.

View kernel:

[root@li1566-231 ~]# uname -r 4.9.36-x86_64-linode85

We can see that the kernel is 4.9.36, which means bbr is supported. Type the following command:

echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf sysctl -p //Save the above execution effect.

The following reply will appear:

net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr

Indicates that the BBR function is enabled.

You can also use the following command:

lsmod | grep bbr

The tcp_bbr module will appear in the return value, but linode does not appear. I don’t know why.

You can also execute the following command to check whether the bbr module is started:

sysctl net.ipv4.tcp_available_congestion_control

Result:

[root@li1566-231 ~]# sysctl net.ipv4.tcp_available_congestion_control net.ipv4.tcp_available_congestion_control = bbr cubic reno bic westwood htcp

We see the bbr module.

Reference for this article: https://gtour.info/linode-vps-tcp-bbr/

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