The Addition of a Spin Bit to the QUIC Transport Protocol
draft-trammell-quic-spin-01

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QUIC                                                    B. Trammell, Ed.
Internet-Draft                                               P. De Vaere
Intended status: Informational                                ETH Zurich
Expires: June 16, 2018                                           R. Even
                                                                  Huawei
                                                             G. Fioccola
                                                          Telecom Italia
                                                              T. Fossati
                                                                   Nokia
                                                                M. Ihlar
                                                                Ericsson
                                                               A. Morton
                                                               AT&T Labs
                                                              E. Stephan
                                                                  Orange
                                                       December 13, 2017

       The Addition of a Spin Bit to the QUIC Transport Protocol
                      draft-trammell-quic-spin-01

Abstract

   This document summarizes work to date on the addition of a "spin
   bit", intended for explicit measurability of end-to-end RTT on QUIC
   flows.  It proposes a detailed mechanism for the spin bit, describes
   how to use it to measure end-to-end latency, discusses corner cases
   and their workarounds in the measurement, describes experimental
   evaluation of the mechanism done to date, and examines the utility
   and privacy implications of the spin bit.  As the overhead and risk
   associated with the spin bit are negligible, and the utility of a
   passive RTT measurement signal at higher resolution than once per
   flow is clear, this document advocates for the addition of the spin
   bit to the protocol.

Status of This Memo

   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).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Trammell, et al.          Expires June 16, 2018                 [Page 1]
Internet-Draft                  Spin Bit                   December 2017

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 16, 2018.

Copyright Notice

   Copyright (c) 2017 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  About This Document . . . . . . . . . . . . . . . . . . .   3
   2.  The Spin Bit Mechanism  . . . . . . . . . . . . . . . . . . .   4
     2.1.  Proposed Short Header Format Including Spin Bit . . . . .   4
   3.  Using the Spin Bit for Passive RTT Measurement  . . . . . . .   5
     3.1.  Limitations and Workarounds . . . . . . . . . . . . . . .   6
     3.2.  Illustration  . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Experimental Evaluation . . . . . . . . . . . . . . . . .   8
   4.  Use Cases for Passive RTT Measurement . . . . . . . . . . . .  10
     4.1.  Inter-domain Troubleshooting  . . . . . . . . . . . . . .  10
     4.2.  Two-Point Intradomain Measurement . . . . . . . . . . . .  11
     4.3.  Bufferbloat Mitigation in Cellular Networks . . . . . . .  12
     4.4.  Locating WiFi Problems in Home Networks . . . . . . . . .  12
     4.5.  Internet Measurement Research . . . . . . . . . . . . . .  13
   5.  Alternate RTT Measurement Approaches for Diagnosing QUIC
       flows . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     5.1.  Handshake RTT measurement . . . . . . . . . . . . . . . .  14
     5.2.  Parallel active measurement . . . . . . . . . . . . . . .  14
     5.3.  Frequency Analysis  . . . . . . . . . . . . . . . . . . .  15
   6.  Greasing  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
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