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Framework for TCP Throughput Testing
RFC 6349

Internet Engineering Task Force (IETF)                    B. Constantine
Request for Comments: 6349                                          JDSU
Category: Informational                                        G. Forget
ISSN: 2070-1721                            Bell Canada (Ext. Consultant)
                                                                 R. Geib
                                                        Deutsche Telekom
                                                              R. Schrage
                                                      Schrage Consulting
                                                             August 2011

                  Framework for TCP Throughput Testing

Abstract

   This framework describes a practical methodology for measuring end-
   to-end TCP Throughput in a managed IP network.  The goal is to
   provide a better indication in regard to user experience.  In this
   framework, TCP and IP parameters are specified to optimize TCP
   Throughput.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6349.

Constantine, et al.           Informational                     [Page 1]
RFC 6349          Framework for TCP Throughput Testing       August 2011

Copyright Notice

   Copyright (c) 2011 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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Requirements Language ......................................4
      1.2. Terminology ................................................5
      1.3. TCP Equilibrium ............................................6
   2. Scope and Goals .................................................7
   3. Methodology .....................................................8
      3.1. Path MTU ..................................................10
      3.2. Round-Trip Time (RTT) and Bottleneck Bandwidth (BB) .......11
           3.2.1. Measuring RTT ......................................11
           3.2.2. Measuring BB .......................................12
      3.3. Measuring TCP Throughput ..................................12
           3.3.1. Minimum TCP RWND ...................................13
   4. TCP Metrics ....................................................16
      4.1. Transfer Time Ratio .......................................16
           4.1.1. Maximum Achievable TCP Throughput Calculation ......17
           4.1.2. TCP Transfer Time and Transfer Time Ratio
                  Calculation ........................................19
      4.2. TCP Efficiency ............................................20
           4.2.1. TCP Efficiency Percentage Calculation ..............20
      4.3. Buffer Delay ..............................................20
           4.3.1. Buffer Delay Percentage Calculation ................21
   5. Conducting TCP Throughput Tests ................................21
      5.1. Single versus Multiple TCP Connections ....................21
      5.2. Results Interpretation ....................................22
   6. Security Considerations ........................................25
      6.1. Denial-of-Service Attacks .................................25
      6.2. User Data Confidentiality .................................25
      6.3. Interference with Metrics .................................25
   7. Acknowledgments ................................................26
   8. Normative References ...........................................26

Constantine, et al.           Informational                     [Page 2]
RFC 6349          Framework for TCP Throughput Testing       August 2011

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