HPCC++: Enhanced High Precision Congestion Control
draft-pan-tsvwg-hpccplus-02

Document Type Active Internet-Draft (individual)
Authors Rui Miao  , Hongqiang Liu  , Rong Pan  , Jeongkeun Lee  , Changhoon Kim  , Barak Gafni  , Yuval Shpigelman 
Last updated 2020-09-11
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Network Working Group                                            R. Miao
Internet-Draft                                                    H. Liu
Intended status: Experimental                              Alibaba Group
Expires: March 15, 2021                                           R. Pan
                                                                  J. Lee
                                                                  C. Kim
                                                       Intel Corporation
                                                                B. Gafni
                                                           Y. Shpigelman
                                             Mellanox Technologies, Inc.
                                                      September 11, 2020

           HPCC++: Enhanced High Precision Congestion Control
                      draft-pan-tsvwg-hpccplus-02

Abstract

   Congestion control (CC) is the key to achieving ultra-low latency,
   high bandwidth and network stability in high-speed networks.
   However, the existing high-speed CC schemes have inherent limitations
   for reaching these goals.

   In this document, we describe HPCC++ (High Precision Congestion
   Control), a new high-speed CC mechanism which achieves the three
   goals simultaneously.  HPCC++ leverages inband telemetry to obtain
   precise link load information and controls traffic precisely.  By
   addressing challenges such as delayed inband telemetry information
   during congestion and overreaction to inband telemetry information,
   HPCC++ can quickly converge to utilize free bandwidth while avoiding
   congestion, and can maintain near-zero in-network queues for ultra-
   low latency.  HPCC++ is also fair and easy to deploy in hardware,
   implementable with commodity NICs and switches.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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Miao, et al.             Expires March 15, 2021                 [Page 1]
Internet-Draft                   HPCC++                   September 2020

   This Internet-Draft will expire on March 15, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  System Overview . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  HPCC++ Algorithm  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Notations . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Design Functions and Procedures . . . . . . . . . . . . .   6
   5.  Configuration Parameters  . . . . . . . . . . . . . . . . . .   8
   6.  Design Enhancement and Implementation . . . . . . . . . . . .   8
     6.1.  HPCC++ Guidelines . . . . . . . . . . . . . . . . . . . .   9
     6.2.  Receiver-based HPCC . . . . . . . . . . . . . . . . . . .   9
   7.  Reference Implementations . . . . . . . . . . . . . . . . . .  10
     7.1.  Inband telemetry padding at the network elements  . . . .  10
     7.2.  Congestion control at NICs  . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     12.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   The link speed in data center networks has grown from 1Gbps to
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