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