TCP-LEDBAT kernel module

This is an implementation of the LEDBAT congestion control algorithm over TCP using the Linux kernel modular congestion control framework.

The current version is updated to compile under Linux kernel 5.4.x versions. A version working with kernels up to 3.3.x is tagged with a "3.3" tag. The module has not been tested with version in between.

The module currently loads properly but it has not been tested thoroughly.

For more information also visit http://perso.telecom-paristech.fr/~drossi/index.php?n=Software.LEDBAT

How to build

• clone the this repository

$ git clone https://github.com/silviov/TCP-LEDBAT.git

• build the module

$ cd TCP-LEDBAT/src
$ make

• load the module

$ sudo make install

How to use the module

After the module has been loaded check "ledbat" should appear among the available congestion control algorithms. You should see something like

$ cat /proc/sys/net/ipv4/tcp_available_congestion_control
cubic reno ledbat

Then you can either use it for all flows by doing

$ sudo sysctl -w net.ipv4.tcp_congestion_control=ledbat

or you can do it on specific sockets via the setsockopt option. You can see an example in the utils/client.c file.

How to debug

At the top of the source file for the module you can find some constant definitions. By setting their values you can select the level of debugging information printed by the module.

In order to see the messages, however, remember to set the debug level of the kernel to DEBUG with the command

$ sudo sysctl kernel.printk=8