silviov / tcp-ledbat Goto Github PK

Kernel module which implemets the LEDBAT congestion control ontop of TCP

Home Page: http://perso.telecom-paristech.fr/~drossi/index.php?n=Software.LEDBAT

C 97.54% Makefile 2.46%

tcp-ledbat's Introduction

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

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tcp-ledbat's Issues

ledbat floods dmesg with "ledbat structure" messages

Is there a way to suppress these messages by default?

[31846.098345] ledbat structure initialized.
[31846.334138] ledbat structure released.
[31846.353774] ledbat structure released.
[31846.498737] ledbat structure released.
[31847.096100] ledbat structure released.
[31847.096148] ledbat structure initialized.
[31847.318997] ledbat structure released.
[31847.319038] ledbat structure initialized.
[31847.353763] ledbat structure released.
[31847.630502] ledbat structure released.
[31848.096091] ledbat structure released.
[31848.361722] ledbat structure released.
[31849.358956] ledbat structure released.
[31850.319753] ledbat structure released.
[31850.344351] ledbat structure released.
[31853.662890] ledbat structure initialized.

Remote hz estimator and owd calculator are too inaccurate.

The remote hz and owd estimations from the tcp_lp code are not accurate enough for ledbat to function. Small errors in remote_hz multiplied by large tsvals result in inaccurate owd estimates that fluctuate wildly.

What are your thoughts on switching to using rtt to estimate queue delay instead of owd? That appears to be what apple has done in their ledbat implementation. https://opensource.apple.com/source/xnu/xnu-2050.7.9/bsd/netinet/tcp_ledbat.c

API Changing in the latest Linux Kernel

It seems that the Linux API has been changed, leading errors when running the make file.

Error messages with input make

Hello,

I'm MB. A very nice and polite guy.

These are the error messages I get after inputting make:

make -C /lib/modules/5.15.32-v8+/build M=/home/pi/TCP-LEDBAT/src modules
make[1]: *** /lib/modules/5.15.32-v8+/build: No such file or directory. Stop.
make: *** [Makefile:6: default] Error 2

Why are the calculations of max_cwnd and offset different from that stated in RFC 6817

I am sorry, I misunderstood the code earlier.

operation not permitted

When trying to use I get an error: operation not permitted.

The docs need to be updated to simply run sudo make install rather than sudo insmod tcp_ledbat.ko. sysctl net.ipv4.tcp_available_congestion_control will say that ledbat is available when it really isn't. The sudo make install script runs the correct steps to make it work properly.

make: *** No rule to make target `install'. Stop.

Hi, the makefile doesn't have a make install

install:
install -v -m 644 tcp_ledbat.ko /lib/modules/$(uname -r)/kernel/net/ipv4/
depmod

..or something like that :)

insmod: ERROR: could not insert module tcp_ledbat.ko: Invalid parameters

Hi,

I am unable to load the module:

$ sudo insmod tcp_ledbat.ko

insmod: ERROR: could not insert module tcp_ledbat.ko: Invalid parameters

I am running Linux Mint 19.2

ERROR: could not insert 'tcp_ledbat

i cant install TCP_LEDBAT on Ubuntu 18 kernel 4.15. the message shows :

modprobe tcp_ledbat
modprobe: ERROR: could not insert 'tcp_ledbat': Invalid argument
Makefile:9: recipe for target 'install' failed
make: *** [install] Error 1