Datacenter TCP (DCTCP): TCP Congestion Control for Datacenters

The information below is for an old version of the document
Document Type Expired Internet-Draft (tcpm WG)
Authors Stephen Bensley  , Lars Eggert  , Dave Thaler  , Praveen Balasubramanian  , Glenn Judd 
Last updated 2016-05-04 (latest revision 2015-11-01)
Replaces draft-bensley-tcpm-dctcp
Stream Internet Engineering Task Force (IETF)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This informational memo describes Datacenter TCP (DCTCP), an improvement to TCP congestion control for datacenter traffic. DCTCP uses improved Explicit Congestion Notification (ECN) processing to estimate the fraction of bytes that encounter congestion, rather than simply detecting that some congestion has occurred. DCTCP then scales the TCP congestion window based on this estimate. This method achieves high burst tolerance, low latency, and high throughput with shallow-buffered switches. This memo also discusses deployment issues related to the coexistence of DCTCP and conventional TCP, the lack of a negotiating mechanism between sender and receiver, and presents some possible mitigations.


Stephen Bensley (
Lars Eggert (
Dave Thaler (
Praveen Balasubramanian (
Glenn Judd (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)