Increasing TCP's Initial Window
draft-ietf-tcpm-initcwnd-07
The information below is for an old version of the document | |||
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Document | Type | Active Internet-Draft (tcpm WG) | |
Last updated | 2013-01-28 | ||
Replaces | draft-hkchu-tcpm-initcwnd | ||
Stream | IETF | ||
Intended RFC status | Experimental | ||
Formats | pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | None | ||
IESG | IESG state | IESG Evaluation::AD Followup | |
Consensus Boilerplate | Unknown | ||
Telechat date |
Needs a YES. |
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Responsible AD | Wesley Eddy | ||
IESG note | Yoshifumi Nishida (nishida@sfc.wide.ad.jp) is the Document Shepherd for this document. | ||
Send notices to | tcpm-chairs@tools.ietf.org, draft-ietf-tcpm-initcwnd@tools.ietf.org |
Internet Draft J. Chu draft-ietf-tcpm-initcwnd-07.txt N. Dukkipati Intended status: Experimental Y. Cheng M. Mathis Expiration date: July 2013 Google, Inc. January 28, 2013 Increasing TCP's Initial Window Status of this Memo Distribution of this memo is unlimited. This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on May, 2013. Copyright Notice Copyright (c) 2012 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Chu, et. al. Expires July 2013 [Page 1] Internet Draft Increasing TCP's Initial Window January 2013 Abstract This document proposes an experiment to increase the permitted TCP initial window (IW) from between 2 and 4 segments, as specified in RFC 3390, to 10 segments, with a fallback to the existing recommendation when performance issues are detected. It discusses the motivation behind the increase, the advantages and disadvantages of the higher initial window, and presents results from several large scale experiments showing that the higher initial window improves the overall performance of many web services without resulting in a congestion collapse. The document closes with a discussion of usage and deployment for further experimental purpose recommended by the IETF TCP Maintenance and Minor Extensions (TCPM) working group. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. TCP Modification . . . . . . . . . . . . . . . . . . . . . . . 4 3. Implementation Issues . . . . . . . . . . . . . . . . . . . . 5 4. Background . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5. Advantages of Larger Initial Windows . . . . . . . . . . . . . 7 5.1 Reducing Latency . . . . . . . . . . . . . . . . . . . . . . 7 5.2 Keeping up with the growth of web object size . . . . . . . 8 5.3 Recovering faster from loss on under-utilized or wireless links . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7. Disadvantages of Larger Initial Windows for the Network . . . 9 8. Mitigation of Negative Impact . . . . . . . . . . . . . . . . 10 9. Interactions with the Retransmission Timer . . . . . . . . . . 10 10. Experimental Results From Large Scale Cluster Tests . . . . . 10 10.1 The benefits . . . . . . . . . . . . . . . . . . . . . . . 11 10.2 The cost . . . . . . . . . . . . . . . . . . . . . . . . . 11 11. Other Studies . . . . . . . . . . . . . . . . . . . . . . . . 12 12. Usage and Deployment Recommendations . . . . . . . . . . . . . 13 13. Related Proposals . . . . . . . . . . . . . . . . . . . . . . 14 14. Security Considerations . . . . . . . . . . . . . . . . . . . 14 15. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 15 16. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 17. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15 Normative References . . . . . . . . . . . . . . . . . . . . . . . 16Show full document text