GSOC2019TCPTestingAndAlignment

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Project Overview

  • Project Name: TCP Testing and Alignment
  • Student: Apoorva Bhargava
  • Mentors: Tom Henderson, Vivek Jain
  • Abstract: This project aims at aligning the ns-3 TCP with Linux kernel to have a more realistic implementation of TCP in ns-3 with proper documentation of the differences. The features of TCP which will be aligned are ECN, RACK, SACK, DSACK, and Paced Chirping. To achieve this, ns-3 DCE (Direct Code Execution) will be used. DCE (Direct Code Execution) is a framework which allows the users to run kernel space protocol inside the ns-3 without changing the source code.
  • Code: to be added
  • About Me: I am a 2nd-year postgraduate student at National Institute of Technology, Karnataka India. I have worked on Implementation of TCP Jersey in ns-3 and Implementation Cautious Adaptive RED in ns-3 in my first year of postgraduate. Currently, I am working on Alignment and Validation of ns-3 TCP with Linux TCP using ns-3 Direct Code Execution framework (DCE).

Technical Approach

Many features of ns-3 TCP are aligned with RFCs but not with TCP implementation in Linux. The main goal of this project is to have Linux like TCP implementation in ns-3 and cover main components of TCP Prague i.e ECN, DCTCP, RACK and Paced Chirping. I have already done the alignment of Slow Start and Congestion Avoidance phase of ns-3 New Reno with Linux TCP Reno and validated it in simple dumbbell topology with one sender and one receiver using ns-3 DCE. Results can be found here. Currently, I am working on alignment of PRR recovery algorithm of ns-3 with Linux using ns-3 DCE as it is default recovery algorithm in Linux kernel. Further, I will work on the alignment of ECN followed by DCTCP, as DCTCP uses ECN feature of TCP in its algorithm. Next, I will cover the alignment of RACK which will also cover the alignment of SACK and DSACK as these two are the pre-requisites. Lastly, the alignment of Paced Chirping will be done. Validation of all the aligned features of ns-3 TCP will be done using ns-3 DCE and provide the proper documentation of all the differences. Also, if time permits I will try to align the ns-3 implementation of TCP Cubic and TCP BBR with Linux kernel.

Milestones and Deliverables

The entire GSoC will be divided into 2 phases and the deliverables at the end of each phase will be as follows:

Phase 1:

  • Align Explicit Congestion Notification (ECN) implementation of ns-3 with Linux.
  • Align Data Center TCP (DCTCP) implementation of ns-3 with Linux.
  • Validate the alignment of ECN in dumbbell topology using ns-3 DCE.
  • Validate the alignment of DCTCP in data center topology using ns3-DCE.

Phase 2:

  • Align ns-3 implementation of Selective Acknowledgement (SACK) and Duplicate Selective Acknowledgement with Linux.
  • Align ns-3 implementation of Recent Acknowledgement (RACK) with Linux.
  • Validate the alignment of SACK, DSACK and RACK using ns-3 DCE.
  • Align ns-3 implementation of Paced Chirping with Linux.
  • Validate the alignment of Paced Chirping using ns-3 DCE.

Weekly Plan

Community Bonding Period (6 May - 26 May 2019)

  • Contact the mentors and update weekly plan according to their suggestions.
  • Setting up a git repository for the project.
  • Get suggestions on the testing scenarios which will be used for the validation.
  • Work on the alignment of PRR as it the default recovery algorithm in Linux.

Week 1 (27 May - 2 June 2019)

  • Start understanding the codebase of ECN in ns-3 as well as in Linux.
  • Document the differences observed in ECN code of ns-3 and Linux.

Week 2 (3 June - 9 June 2019 )

  • Align the differences found in ECN and validate the implementation in dumbbell topology using DCE.

Week 3 (10 June - 16 June 2019)

  • Validate Data Center TCP in data center topology using DCE.

Week 4 (17 June - 23 June 2019)

  • Start understanding the codebase of SACK in ns-3 as well as Linux.
  • Document the differences observed.

Week 5 (24 June - 30 June 2019)

  • Align the differences found in SACK and validate the implementation using DCE.

Week 6 (1 July - 7 July 2019)

  • Study the codebase of DSACK in ns-3 and Linux.
  • Document the differences observed.

Week 7 (8 July - 14 July 2019)

  • Align the differences found in DSACK and validate the implementation using DCE.

Week 8 (15 July - 21 July 2019)

  • Study the codebase of RACK in ns-3 as well as in Linux.
  • Document the differences.

Week 9 (22 July - 28 July 2019)

  • Align the differences found in RACK and validate the implementation using DCE.

Week 10 (29 July - 4 August 2019)

  • Study the codebase of Paced Chirping in ns-3 as well as Linux.
  • Document the differences.

Week 11 (5 August - 11 August 2019)

  • Align the differences found in Paced Chirping and validate the implementation using DCE.

Week 12 (13 August - 19 August 2019)

  • Submit all the required patches.

Weekly Progress

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