PIE: A Lightweight Control Scheme To Address the Bufferbloat Problem
draft-ietf-aqm-pie-00

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Last updated 2014-10-28 (latest revision 2014-10-27)
Replaces draft-pan-aqm-pie
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Internet Draft                            R. Pan, P. Natarajan, F. Baker
Active Queue Management              B. VerSteeg, M. Prabhu, C. Piglione
Working Group                                   V. Subramanian, G. White

Expires: April 30, 2015                                 October 27, 2014

           PIE: A Lightweight Control Scheme To Address the 
                          Bufferbloat Problem 

                      draft-ietf-aqm-pie-00

Abstract

   Bufferbloat is a phenomenon where excess buffers in the network cause
   high latency and jitter. As more and more interactive applications
   (e.g. voice over IP, real time video streaming and financial
   transactions) run in the Internet, high latency and jitter degrade
   application performance. There is a pressing need to design
   intelligent queue management schemes that can control latency and
   jitter; and hence provide desirable quality of service to users. 

   We present here a lightweight design, PIE (Proportional Integral
   controller Enhanced) that can effectively control the average
   queueing latency to a target value. Simulation results, theoretical
   analysis and Linux testbed results have shown that PIE can ensure low
   latency and achieve high link utilization under various congestion
   situations. The design does not require per-packet timestamp, so it
   incurs very small overhead and is simple enough to implement in both
   hardware and software. 

Status of this Memo

   This Internet-Draft is submitted to IETF 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."

 

Pan et al.               Expires April 30, 2015                 [Page 1]
INTERNET DRAFT                    PIE                   October 27, 2014

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Copyright and License 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
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   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3. Design Goals  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4. The BASIC PIE Scheme  . . . . . . . . . . . . . . . . . . . . .  6
     4.1 Random Dropping  . . . . . . . . . . . . . . . . . . . . . .  6
     4.2 Drop Probability Calculation . . . . . . . . . . . . . . . .  7
     4.3 Departure Rate Estimation  . . . . . . . . . . . . . . . . .  8
   5. Design Enhancement  . . . . . . . . . . . . . . . . . . . . . .  9
     5.1 Turning PIE on and off . . . . . . . . . . . . . . . . . . .  9
     5.2 Auto-tuning of PIE's control parameters  . . . . . . . . . .  9
     5.3 Handling Bursts  . . . . . . . . . . . . . . . . . . . . . . 10
     5.4 De-randomization . . . . . . . . . . . . . . . . . . . . . . 11
   6. Implementation and Discussions  . . . . . . . . . . . . . . . . 11
   7. Incremental Deployment  . . . . . . . . . . . . . . . . . . . . 13
   8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 13
   9. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1  Normative References  . . . . . . . . . . . . . . . . . . . 14
     9.2  Informative References  . . . . . . . . . . . . . . . . . . 14
     9.3  Other References  . . . . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
   10. The PIE pseudo Code  . . . . . . . . . . . . . . . . . . . . . 16

 

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INTERNET DRAFT                    PIE                   October 27, 2014

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