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FlexPass ns-2 simulator (EuroSys 2023)

This is an official Github repository for the EuroSys '23 paper "FlexPass: A Case for Flexible Credit-based Transport for Datacenter Networks". The repository includes our implementation of FlexPass on the ns-2 simulator.

Quick Start

We provide a pre-built docker image at ghcr.io/kaist-ina/ns2-flexpass. Use the following command to set-up the docker image.

docker pull ghcr.io/kaist-ina/ns2-flexpass

How to run experiments

  1. We provide a python script named runs_simulations.py to automate simulations. Use following command to run all simulations.

    docker run --rm -it \
    -v $(pwd)/result:/ns-allinone-2.35/ns-2.35/outputs \
    ghcr.io/kaist-ina/ns2-flexpass \
    python ./run_simulations.py

    The result will be stored in result directory.

  2. We provide a python script named generate_figure.py to analyze results and generate figures from it.

    docker run --rm -it \
    -v $(pwd)/result:/ns-allinone-2.35/ns-2.35/outputs \
    ghcr.io/kaist-ina/ns2-flexpass \
    python ./generate_figure.py

    The CSV files and figures (in PNG) will be stored in the result directory.

Major modifications from the vanilla ns-2.35

  • Files in xpass:

    Core FlexPass and ExpressPass implementation.

  • Files in workloads:

    Example workload files for the simulation.

  • queue/broadcom-node.cc and queue/broadcom-node.h:

    Implementation for a Broadcom ASIC switch model. These includes selective dropping for TLT, dynamic buffer management. This is the ns-2 backport from here.

    Disclaimer: this module is purely based on authors' personal understanding of Broadcom ASIC. It does not reflect any official confirmation from either Microsoft or Broadcom.

  • Other files in queue:

    Implementation of queues that support ExpressPass and FlexPass.

  • tcp/tcp-xpass.cc and tcp/tcp-xpass.h:

    Layering (LY) implementation of ExpressPass.

Credit

This code repository is based on https://github.com/kaist-ina/ns2-xpass.