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
12All switches in the data center network running DCTCP must support ECN
13marking and be configured for marking when reaching defined switch buffer
14thresholds. The default ECN marking threshold heuristic for DCTCP on
15switches is 20 packets (30KB) at 1Gbps, and 65 packets (~100KB) at 10Gbps,
16but might need further careful tweaking.
17
18For more details, see below documents:
19
20Paper:
21
22The algorithm is further described in detail in the following two
23SIGCOMM/SIGMETRICS papers:
24
25 i) Mohammad Alizadeh, Albert Greenberg, David A. Maltz, Jitendra Padhye,
26    Parveen Patel, Balaji Prabhakar, Sudipta Sengupta, and Murari Sridharan:
27      "Data Center TCP (DCTCP)", Data Center Networks session
28      Proc. ACM SIGCOMM, New Delhi, 2010.
29    http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
30    http://www.sigcomm.org/ccr/papers/2010/October/1851275.1851192
31
32ii) Mohammad Alizadeh, Adel Javanmard, and Balaji Prabhakar:
33      "Analysis of DCTCP: Stability, Convergence, and Fairness"
34      Proc. ACM SIGMETRICS, San Jose, 2011.
35    http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp_analysis-full.pdf
36
37IETF informational draft:
38
39  http://tools.ietf.org/html/draft-bensley-tcpm-dctcp-00
40
41DCTCP site:
42
43  http://simula.stanford.edu/~alizade/Site/DCTCP.html
44