162306a36Sopenharmony_ci.. SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci====================== 462306a36Sopenharmony_ciDCTCP (DataCenter TCP) 562306a36Sopenharmony_ci====================== 662306a36Sopenharmony_ci 762306a36Sopenharmony_ciDCTCP is an enhancement to the TCP congestion control algorithm for data 862306a36Sopenharmony_cicenter networks and leverages Explicit Congestion Notification (ECN) in 962306a36Sopenharmony_cithe data center network to provide multi-bit feedback to the end hosts. 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ciTo enable it on end hosts:: 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci sysctl -w net.ipv4.tcp_congestion_control=dctcp 1462306a36Sopenharmony_ci sysctl -w net.ipv4.tcp_ecn_fallback=0 (optional) 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ciAll switches in the data center network running DCTCP must support ECN 1762306a36Sopenharmony_cimarking and be configured for marking when reaching defined switch buffer 1862306a36Sopenharmony_cithresholds. The default ECN marking threshold heuristic for DCTCP on 1962306a36Sopenharmony_ciswitches is 20 packets (30KB) at 1Gbps, and 65 packets (~100KB) at 10Gbps, 2062306a36Sopenharmony_cibut might need further careful tweaking. 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ciFor more details, see below documents: 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_ciPaper: 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ciThe algorithm is further described in detail in the following two 2762306a36Sopenharmony_ciSIGCOMM/SIGMETRICS papers: 2862306a36Sopenharmony_ci 2962306a36Sopenharmony_ci i) Mohammad Alizadeh, Albert Greenberg, David A. Maltz, Jitendra Padhye, 3062306a36Sopenharmony_ci Parveen Patel, Balaji Prabhakar, Sudipta Sengupta, and Murari Sridharan: 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci "Data Center TCP (DCTCP)", Data Center Networks session" 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci Proc. ACM SIGCOMM, New Delhi, 2010. 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf 3762306a36Sopenharmony_ci http://www.sigcomm.org/ccr/papers/2010/October/1851275.1851192 3862306a36Sopenharmony_ci 3962306a36Sopenharmony_ciii) Mohammad Alizadeh, Adel Javanmard, and Balaji Prabhakar: 4062306a36Sopenharmony_ci 4162306a36Sopenharmony_ci "Analysis of DCTCP: Stability, Convergence, and Fairness" 4262306a36Sopenharmony_ci Proc. ACM SIGMETRICS, San Jose, 2011. 4362306a36Sopenharmony_ci 4462306a36Sopenharmony_ci http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp_analysis-full.pdf 4562306a36Sopenharmony_ci 4662306a36Sopenharmony_ciIETF informational draft: 4762306a36Sopenharmony_ci 4862306a36Sopenharmony_ci http://tools.ietf.org/html/draft-bensley-tcpm-dctcp-00 4962306a36Sopenharmony_ci 5062306a36Sopenharmony_ciDCTCP site: 5162306a36Sopenharmony_ci 5262306a36Sopenharmony_ci http://simula.stanford.edu/~alizade/Site/DCTCP.html 53