Question

1

Why there's no tcp_westwood?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1806 / 2 Years ago, fri, august 19, 2022, 2:09:27

I am on Ubuntu server 12.04

$ sudo cat /etc/issue /etc/lsb-release

Ubuntu 12.04.1 LTS 

 l



DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=12.04

DISTRIB_CODENAME=precise

DISTRIB_DESCRIPTION="Ubuntu 12.04.1 LTS"



$ uname -a

Linux vps2 2.6.32-042stab078.28 #1 SMP Mon Jul 8 10:17:22 MSK 2013 x86_64 x86_64 x86_64 GNU/Linux

According to this http://manpages.ubuntu.com/manpages/precise/man7/tcp.7.html

there should be tcp_westwood, but I can't find on my server:

$ sudo echo 1 > /proc/sys/net/ipv4/tcp_westwood

-bash: /proc/sys/net/ipv4/tcp_westwood: No such file or directory



$ sudo tail /proc/sys/net/ipv4/*congest*

==> /proc/sys/net/ipv4/tcp_allowed_congestion_control <==

cubic reno



==> /proc/sys/net/ipv4/tcp_available_congestion_control <==

cubic reno



==> /proc/sys/net/ipv4/tcp_congestion_control <==

cubic

So how could I enable tcp westwood for 12.04 lts?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

etzelmortg

Add To Favorites

Follow

Total Points: 430

Total Questions: 105

Total Answers: 106

Location: Suriname

Member since Sun, Jun 13, 2021

3 Years ago

etzelmortg questions

1 How to resolve the error : 'Package gcc-8 has no installation candidate' ? I'm trying to install it by sudo-apt install gcc-8

Sat, Sep 18, 21, 18:04, 3 Years ago

1 Bash - How to add new line when appending text to a file?

Fri, Oct 28, 22, 13:09, 2 Years ago

1 Allocate more space for copying files via live CD

Mon, Feb 21, 22, 13:49, 2 Years ago

1 Intel Iris Xe, laggy performance in 20.04 LTS, and also in 21.04 (solved)

Mon, Aug 30, 21, 01:52, 3 Years ago

1 Is there a way to change the default login/password prompts?

Wed, Nov 10, 21, 11:13, 3 Years ago

View All

answered 2 Years ago impisaso · Accepted Answer

If you read again it will tell you the reason:

tcp_westwood (Boolean; default: disabled; Linux 2.4.26/2.6.3 to 2.6.13)
Enable TCP Westwood+ congestion control algorithm. TCP
Westwood+ is a sender-side only modification of the TCP Reno
protocol stack that optimizes the performance of TCP congestion
control. It is based on end-to-end bandwidth estimation to set
congestion window and slow start threshold after a congestion
episode. Using this estimation, TCP Westwood+ adaptively sets a
slow start threshold and a congestion window which takes into
account the bandwidth used at the time congestion is
experienced. TCP Westwood+ significantly increases fairness
with respect to TCP Reno in wired networks and throughput over
wireless links.

So, what happens here?

By default, that option is not activated in the kernel.

Was meant implemented in kernels 2.4.26/2.6.3 to 2.6.13.

There should be alternatives more recent to what you try to do.

Options:

Not using this.

Build your own kernel and activate the option.

Using the -generic kernel.

Installing the user-mode-linux package.