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- DCTCP (DataCenter TCP)
- ----------------------
- DCTCP is an enhancement to the TCP congestion control algorithm for data
- center networks and leverages Explicit Congestion Notification (ECN) in
- the data center network to provide multi-bit feedback to the end hosts.
- To enable it on end hosts:
- sysctl -w net.ipv4.tcp_congestion_control=dctcp
- sysctl -w net.ipv4.tcp_ecn_fallback=0 (optional)
- All switches in the data center network running DCTCP must support ECN
- marking and be configured for marking when reaching defined switch buffer
- thresholds. The default ECN marking threshold heuristic for DCTCP on
- switches is 20 packets (30KB) at 1Gbps, and 65 packets (~100KB) at 10Gbps,
- but might need further careful tweaking.
- For more details, see below documents:
- Paper:
- The algorithm is further described in detail in the following two
- SIGCOMM/SIGMETRICS papers:
- i) 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.
- http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
- http://www.sigcomm.org/ccr/papers/2010/October/1851275.1851192
- ii) Mohammad Alizadeh, Adel Javanmard, and Balaji Prabhakar:
- "Analysis of DCTCP: Stability, Convergence, and Fairness"
- Proc. ACM SIGMETRICS, San Jose, 2011.
- http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp_analysis-full.pdf
- IETF informational draft:
- http://tools.ietf.org/html/draft-bensley-tcpm-dctcp-00
- DCTCP site:
- http://simula.stanford.edu/~alizade/Site/DCTCP.html
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