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# NS-3 simulator for TLT This is an official Github repository for the Eurosys '21 paper "[Towards timeout-less transport in commodity datacenter networks.](https://dl.acm.org/doi/10.1145/3447786.3456227)". * For the VMA testbed implementation, please visit [https://github.com/kaist-ina/libvma-tlt-public](https://github.com/kaist-ina/libvma-tlt-public). This repository provides a NS-3 simulator for TLT, based on version 3.29. This simlator includes PFC implementation from [here](https://github.com/bobzhuyb/ns3-rdma) and custom DCTCP implementation. If you find this repository useful in your research, please consider citing: ``` @inproceedings{10.1145/3447786.3456227, author = {Lim, Hwijoon and Bai, Wei and Zhu, Yibo and Jung, Youngmok and Han, Dongsu}, title = {Towards Timeout-Less Transport in Commodity Datacenter Networks}, year = {2021}, isbn = {9781450383349}, publisher = {Association for Computing Machinery}, address = {New York, NY, USA}, url = {https://doi.org/10.1145/3447786.3456227}, doi = {10.1145/3447786.3456227} } ``` ### Note This simulator implements TLT for TCP and DCTCP. This may include minor We implemented TLT for RDMA on top of the different codebase. We plan to open-source the RDMA flavored version for TLT on request. ## Guide ### 0. Prerequisites We tested the simulator on Ubuntu 18.04, but latest versions of Ubuntu should also work. ``` sudo apt install build-essential python3 libgtk-3-0 bzip2 ``` ### 1. Configure ``` wget https://www.nsnam.org/releases/ns-allinone-3.29.tar.bz2 tar -xvf ns-allinone-3.29.tar.bz2 cd ns-allinone-3.29 rm -rf ns-3.29 git clone https://github.com/kaist-ina/ns3-tlt-tcp-public.git ns-3.29 cd ns-3.29 ./waf configure --build-profile=optimized ``` ### 2. Build and Run simulations You can run the large-scale simulation from the paper by issuing following: ``` ./waf --run 'tcp-realistic-workload-bgfg config/config.txt' ``` ## Configuration You can configure the simulator by changing `config/config.txt` file. (TBU) ## Modifications from the vanilla ns-3.29 ``` .gitignore | 11 +- README | 117 - README.md | 171 ++ config/config.txt | 73 + config/topology96.txt | 158 ++ examples/tutorial/examples-to-run.py | 1 + examples/tutorial/wscript | 4 + scratch/tcp-realistic-workload-bgfg.cc | 1188 ++++++++++ src/applications/model/flow-id-num-tag.cc | 76 + src/applications/model/flow-id-num-tag.h | 35 + src/applications/model/flow-stat-tag.cc | 72 + src/applications/model/flow-stat-tag.h | 37 + src/applications/model/packet-sink.cc | 2 +- src/applications/model/seq-ts-header.cc | 18 +- src/applications/model/seq-ts-header.h | 4 + src/applications/wscript | 4 + src/broadcom/utils/broadcom-egress-queue.cc | 776 +++++++ src/broadcom/utils/broadcom-egress-queue.h | 102 + src/broadcom/wscript | 15 + src/core/model/random-variable-stream.cc | 14 +- src/internet/bindings/modulegen__gcc_ILP32.py | 2 +- src/internet/bindings/modulegen__gcc_LP64.py | 2 +- src/internet/helper/selective-packet-queue.cc | 318 +++ src/internet/helper/selective-packet-queue.h | 76 + src/internet/model/ipv4-ecn-tag.cc | 58 + src/internet/model/ipv4-ecn-tag.h | 36 + src/internet/model/ipv4-global-routing.cc | 142 +- src/internet/model/ipv4-global-routing.h | 8 +- src/internet/model/rtt-estimator.cc | 2 +- src/internet/model/tcp-congestion-ops.cc | 20 + src/internet/model/tcp-congestion-ops.h | 46 +- src/internet/model/tcp-dctcp.cc | 182 ++ src/internet/model/tcp-dctcp.h | 48 + src/internet/model/tcp-l4-protocol.cc | 100 +- src/internet/model/tcp-l4-protocol.h | 1 + src/internet/model/tcp-option-ts.cc | 6 +- src/internet/model/tcp-socket-base.cc | 1593 ++++++++++++- src/internet/model/tcp-socket-base.h | 84 +- src/internet/model/tcp-socket-state.h | 10 + src/internet/model/tcp-socket.cc | 12 +- src/internet/model/tcp-tx-buffer.cc | 4 +- src/internet/model/tlt-tag.cc | 78 + src/internet/model/tlt-tag.h | 44 + src/internet/wscript | 8 + src/network/model/broadcom-node.cc | 704 ++++++ src/network/model/broadcom-node.h | 211 ++ src/network/model/node.cc | 35 +- src/network/model/node.h | 9 + src/network/model/socket.cc | 41 +- src/network/model/socket.h | 21 + src/network/model/tcp-flow-id-tag.cc | 57 + src/network/model/tcp-flow-id-tag.h | 34 + src/network/utils/data-rate.cc | 41 + src/network/utils/data-rate.h | 12 + src/network/utils/pfc-experience-tag.cc | 59 + src/network/utils/pfc-experience-tag.h | 36 + src/network/utils/queue.cc | 2 +- src/network/utils/queue.h | 2 +- src/network/wscript | 6 + src/point-to-point/helper/qbb-helper.cc | 323 +++ src/point-to-point/helper/qbb-helper.h | 188 ++ src/point-to-point/model/cn-header.cc | 170 ++ src/point-to-point/model/cn-header.h | 94 + src/point-to-point/model/irn-header.cc | 108 + src/point-to-point/model/irn-header.h | 64 + src/point-to-point/model/pause-header.cc | 114 + src/point-to-point/model/pause-header.h | 77 + .../model/point-to-point-net-device.h | 17 +- src/point-to-point/model/qbb-channel.cc | 164 ++ src/point-to-point/model/qbb-channel.h | 194 ++ src/point-to-point/model/qbb-header.cc | 96 + src/point-to-point/model/qbb-header.h | 61 + src/point-to-point/model/qbb-net-device.cc | 2401 ++++++++++++++++++++ src/point-to-point/model/qbb-net-device.h | 359 +++ src/point-to-point/model/qbb-remote-channel.cc | 80 + src/point-to-point/model/qbb-remote-channel.h | 47 + src/point-to-point/wscript | 19 +- waf | 0 workloads/DCTCP_CDF.txt | 12 + workloads/cachefollower.txt | 23 + workloads/mining.txt | 7 + workloads/search.txt | 12 + workloads/webserver.txt | 13 + 83 files changed, 11429 insertions(+), 242 deletions(-) ``` - `src/internet/tcp-socket-base.cc` and `.h`, `src/internet/tlt-tag.cc` and `.h`: Core TLT implementation. - `scratch/tcp-realistic-workload-bgfg.cc`: The `main()` function. - Files in `workloads` and `config`: Configuration for the simulation and workloads. - Files in `src/broadcom` and `src/network`: Implementation for a Broadcom ASIC switch model. These includes selective dropping for TLT, dynamic buffer management, PFC and ECN triggering. Refer [here](https://github.com/bobzhuyb/ns3-rdma#what-did-we-add-exactly) for details. *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.* - Files in `src/internet`: Mostly DCTCP implementation, and some for DSCP marking on TLT. - Files mentioned [here](https://github.com/bobzhuyb/ns3-rdma#what-did-we-add-exactly). RDMA, PFC, DCQCN implementation. - Others Mostly packet tag, header for the stastics purposes.

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