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Validation of BBR Congestion Control in ns-3 vs Linux

This repository contains the files to validate the implementation of BBR in ns-3 vs its implementation in Linux.

Note: Ubuntu 20.04 was used for this work.

Steps to generate ns-3 plot

  • Clone the ns-3-dev repository: https://gitlab.com/nsnam/ns-3-dev
  • Installation steps are described here: https://www.nsnam.org/wiki/Installation#Ubuntu.2FDebian.2FMint
  • Copy tcp-bbr-example.cc from the ns-3 scripts directory provided in this repository and paste it in ns-3-dev/scratch
  • Copy Plot Scripts directory from the ns-3 scripts directory provided in this repository and paste it in the ns-3 root directory (i.e., in parallel to src or scratch)
  • Run tcp-bbr-example.cc using the following command:
./waf --run scratch/tcp-bbr-example
  • The results will be stored in a new directory called bbr-results
  • Plot the congestion window graph using gnuplotScriptCwnd and cwnd.plotme

Steps to generate NeST plot

  • Clone the NeST repository: https://gitlab.com/nitk-nest/nest
  • Installation steps are described here: https://gitlab.com/nitk-nest/nest/-/blob/master/INSTALL.md
  • Copy tcp-bbr-example.py from the NeST scripts directory provided in this repository and paste it in nest/examples
  • Run tcp-bbr-example.py using the following command:
sudo python3 tcp-bbr-example.py
  • The results will be stored in a new directory starting with a string BBR_validation
  • The plot for congestion window is available in ss directory

Final Result with overlapped plot

When the congestion window plots from ns-3 and NeST are overlapped, you should get the plot as shown below:

Final graph

Acknowledgments

This work was a joint effort by the following students at National Institute of Technology Karnataka, Surathkal, India:

  • ns-3 scripts were developed by Aarti Nandagiri and Vivek Jain
  • NeST scripts were developed by Sushma Meena and Aditya Chaudhary

The details of BBR implementation in ns-3 are published in:

Vivek Jain, Viyom Mittal and Mohit P. Tahiliani. "Design and Implementation of TCP BBR in ns-3." Proceedings of the 10th Workshop on ns-3. 2018.

Link: https://dl.acm.org/doi/10.1145/3199902.3199911