RFC 8257 on Data Center TCP (DCTCP): TCP Congestion Control for Data Centers

rfc-editor@rfc-editor.org Tue, 17 October 2017 23:28 UTC

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Subject: RFC 8257 on Data Center TCP (DCTCP): TCP Congestion Control for Data Centers
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8257

        Title:      Data Center TCP (DCTCP): TCP Congestion Control
                    for Data Centers 
        Author:     S. Bensley,
                    D. Thaler,
                    P. Balasubramanian,
                    L. Eggert,
                    G. Judd
        Status:     Informational
        Stream:     IETF
        Date:       October 2017
        Mailbox:    sbens@microsoft.com, 
                    dthaler@microsoft.com, 
                    pravb@microsoft.com,
                    lars@netapp.com, 
                    glenn.judd@morganstanley.com
        Pages:      17
        Characters: 37357
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-tcpm-dctcp-10.txt

        URL:        https://www.rfc-editor.org/info/rfc8257

        DOI:        10.17487/RFC8257

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.

This document is a product of the TCP Maintenance and Minor Extensions Working Group of the IETF.


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