RFC 8257

Data Center TCP (DCTCP): TCP Congestion Control for Data Centers, October 2017

Canonical URL:
https://www.rfc-editor.org/rfc/rfc8257.txt
File formats:
Plain TextPDF
Status:
INFORMATIONAL
Authors:
S. Bensley
D. Thaler
P. Balasubramanian
L. Eggert
G. Judd
Stream:
IETF
Source:
tcpm (tsv)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC8257

Discuss this RFC: Send questions or comments to tcpm@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

This Informational RFC describes Data Center TCP (DCTCP): a TCP congestion control scheme for data-center traffic. DCTCP extends the 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, discusses the lack of a negotiating mechanism between sender and receiver, and presents some possible mitigations. This memo documents DCTCP as currently implemented by several major operating systems. DCTCP, as described in this specification, is applicable to deployments in controlled environments like data centers, but it must not be deployed over the public Internet without additional measures.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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