53 lines
1.7 KiB
ReStructuredText
53 lines
1.7 KiB
ReStructuredText
|
.. SPDX-License-Identifier: GPL-2.0
|
||
|
|
|
||
|
|
======================
|
||
|
|
DCTCP (DataCenter TCP)
|
||
|
|
======================
|
||
|
|
|
||
|
|
DCTCP is an enhancement to the TCP congestion control algorithm for data
|
||
|
|
center networks and leverages Explicit Congestion Notification (ECN) in
|
||
|
|
the data center network to provide multi-bit feedback to the end hosts.
|
||
|
|
|
||
|
|
To enable it on end hosts::
|
||
|
|
|
||
|
|
sysctl -w net.ipv4.tcp_congestion_control=dctcp
|
||
|
|
sysctl -w net.ipv4.tcp_ecn_fallback=0 (optional)
|
||
|
|
|
||
|
|
All switches in the data center network running DCTCP must support ECN
|
||
|
|
marking and be configured for marking when reaching defined switch buffer
|
||
|
|
thresholds. The default ECN marking threshold heuristic for DCTCP on
|
||
|
|
switches is 20 packets (30KB) at 1Gbps, and 65 packets (~100KB) at 10Gbps,
|
||
|
|
but might need further careful tweaking.
|
||
|
|
|
||
|
|
For more details, see below documents:
|
||
|
|
|
||
|
|
Paper:
|
||
|
|
|
||
|
|
The algorithm is further described in detail in the following two
|
||
|
|
SIGCOMM/SIGMETRICS papers:
|
||
|
|
|
||
|
|
i) Mohammad Alizadeh, Albert Greenberg, David A. Maltz, Jitendra Padhye,
|
||
|
|
Parveen Patel, Balaji Prabhakar, Sudipta Sengupta, and Murari Sridharan:
|
||
|
|
|
||
|
|
"Data Center TCP (DCTCP)", Data Center Networks session"
|
||
|
|
|
||
|
|
Proc. ACM SIGCOMM, New Delhi, 2010.
|
||
|
|
|
||
|
|
http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf
|
||
|
|
http://www.sigcomm.org/ccr/papers/2010/October/1851275.1851192
|
||
|
|
|
||
|
|
ii) Mohammad Alizadeh, Adel Javanmard, and Balaji Prabhakar:
|
||
|
|
|
||
|
|
"Analysis of DCTCP: Stability, Convergence, and Fairness"
|
||
|
|
Proc. ACM SIGMETRICS, San Jose, 2011.
|
||
|
|
|
||
|
|
http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp_analysis-full.pdf
|
||
|
|
|
||
|
|
IETF informational draft:
|
||
|
|
|
||
|
|
http://tools.ietf.org/html/draft-bensley-tcpm-dctcp-00
|
||
|
|
|
||
|
|
DCTCP site:
|
||
|
|
|
||
|
|
http://simula.stanford.edu/~alizade/Site/DCTCP.html
|