1DCTCP (DataCenter TCP)
2----------------------
3
4DCTCP is an enhancement to the TCP congestion control algorithm for data
5center networks and leverages Explicit Congestion Notification (ECN) in
6the data center network to provide multi-bit feedback to the end hosts.
7
8To enable it on end hosts:
9
10  sysctl -w net.ipv4.tcp_congestion_control=dctcp
11  sysctl -w net.ipv4.tcp_ecn_fallback=0 (optional)
12
13All switches in the data center network running DCTCP must support ECN
14marking and be configured for marking when reaching defined switch buffer
15thresholds. The default ECN marking threshold heuristic for DCTCP on
16switches is 20 packets (30KB) at 1Gbps, and 65 packets (~100KB) at 10Gbps,
17but might need further careful tweaking.
18
19For more details, see below documents:
20
21Paper:
22
23The algorithm is further described in detail in the following two
24SIGCOMM/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
33ii) 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
38IETF informational draft:
39
40  http://tools.ietf.org/html/draft-bensley-tcpm-dctcp-00
41
42DCTCP site:
43
44  http://simula.stanford.edu/~alizade/Site/DCTCP.html
45