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1 | .. SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | ====================== | |
e3118e83 | 4 | DCTCP (DataCenter TCP) |
8447bb44 | 5 | ====================== |
e3118e83 DB |
6 | |
7 | DCTCP is an enhancement to the TCP congestion control algorithm for data | |
8 | center networks and leverages Explicit Congestion Notification (ECN) in | |
9 | the data center network to provide multi-bit feedback to the end hosts. | |
10 | ||
8447bb44 | 11 | To enable it on end hosts:: |
e3118e83 DB |
12 | |
13 | sysctl -w net.ipv4.tcp_congestion_control=dctcp | |
49213555 | 14 | sysctl -w net.ipv4.tcp_ecn_fallback=0 (optional) |
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15 | |
16 | All switches in the data center network running DCTCP must support ECN | |
17 | marking and be configured for marking when reaching defined switch buffer | |
18 | thresholds. The default ECN marking threshold heuristic for DCTCP on | |
19 | switches is 20 packets (30KB) at 1Gbps, and 65 packets (~100KB) at 10Gbps, | |
20 | but might need further careful tweaking. | |
21 | ||
22 | For more details, see below documents: | |
23 | ||
24 | Paper: | |
25 | ||
26 | The algorithm is further described in detail in the following two | |
27 | SIGCOMM/SIGMETRICS papers: | |
28 | ||
29 | i) Mohammad Alizadeh, Albert Greenberg, David A. Maltz, Jitendra Padhye, | |
30 | Parveen Patel, Balaji Prabhakar, Sudipta Sengupta, and Murari Sridharan: | |
8447bb44 MCC |
31 | |
32 | "Data Center TCP (DCTCP)", Data Center Networks session" | |
33 | ||
e3118e83 | 34 | Proc. ACM SIGCOMM, New Delhi, 2010. |
8447bb44 | 35 | |
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36 | http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf |
37 | http://www.sigcomm.org/ccr/papers/2010/October/1851275.1851192 | |
38 | ||
39 | ii) Mohammad Alizadeh, Adel Javanmard, and Balaji Prabhakar: | |
8447bb44 | 40 | |
e3118e83 DB |
41 | "Analysis of DCTCP: Stability, Convergence, and Fairness" |
42 | Proc. ACM SIGMETRICS, San Jose, 2011. | |
8447bb44 | 43 | |
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44 | http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp_analysis-full.pdf |
45 | ||
46 | IETF informational draft: | |
47 | ||
48 | http://tools.ietf.org/html/draft-bensley-tcpm-dctcp-00 | |
49 | ||
50 | DCTCP site: | |
51 | ||
52 | http://simula.stanford.edu/~alizade/Site/DCTCP.html |