This is an implementation of TCP Inigo, which takes the measure of the extent of congestion introduced in DCTCP and applies it to networks outside the data center.
TCP Inigo: Fighting Congestion With Both Hands describes the enhancements being pursued in this project. At this point, only the RTT-based congestion control, RTT-fairness, and stability enhancements have been implemented.
Mininet tests for TCP Inigo include the basic Iperf incast test that was done by the Mininet folks for DCTCP, as well as the ability run Flent, aka netperf-wrapper tests.
Experiments show that TCP Inigo is able to keep queue depths at DCTCP levels using only RTTs as a signal of congestion. And Inigo can use both.
The motivation behind the RTT fairness functionality comes from the 2nd DCTCP paper listed below.
Authors:
Andrew Shewmaker <agshew@gmail.com>
Forked from DataCenter TCP (DCTCP) congestion control.
DCTCP is an enhancement to the TCP congestion control algorithm designed for data centers. DCTCP leverages Explicit Congestion Notification (ECN) in the network to provide multi-bit feedback to the end hosts. DCTCP's goal is to meet the following three data center transport requirements:
- High burst tolerance (incast due to partition/aggregate)
- Low latency (short flows, queries)
- High throughput (continuous data updates, large file transfers) with commodity shallow buffered switches
The algorithm is described in detail in the following two papers:
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Mohammad Alizadeh, Albert Greenberg, David A. Maltz, Jitendra Padhye, Parveen Patel, Balaji Prabhakar, Sudipta Sengupta, and Murari Sridharan: "Data Center TCP (DCTCP)", Data Center Networks session Proc. ACM SIGCOMM, New Delhi, 2010. PDF
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Mohammad Alizadeh, Adel Javanmard, and Balaji Prabhakar: "Analysis of DCTCP: Stability, Convergence, and Fairness" Proc. ACM SIGMETRICS, San Jose, 2011. PDF
Initial prototype from Abdul Kabbani, Masato Yasuda and Mohammad Alizadeh.
DCTCP Authors:
Daniel Borkmann <dborkman@redhat.com>
Florian Westphal <fw@strlen.de>
Glenn Judd <glenn.judd@morganstanley.com>
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.