HPCC++: Enhanced High Precision Congestion Control
draft-pan-tsvwg-hpccplus-00

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Last updated 2020-06-17
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Network Working Group                                             H. Liu
Internet-Draft                                                   R. Miao
Intended status: Experimental                              Alibaba Group
Expires: December 19, 2020                                        R. Pan
                                                                 JK. Lee
                                                                  C. Kim
                                                       Intel Corporation
                                                           June 17, 2020

           HPCC++: Enhanced High Precision Congestion Control
                      draft-pan-tsvwg-hpccplus-00

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 in-network telemetry (INT) to
   obtain precise link load information and controls traffic precisely.
   By addressing challenges such as delayed INT information during
   congestion and overreaction to INT 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 programmable NICs and switches.

Status of This Memo

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   This Internet-Draft will expire on December 19, 2020.

Liu, et al.             Expires December 19, 2020               [Page 1]
Internet-Draft                   HPCC++                        June 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  System Overview . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  HPCC++ Algorithm  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Notations . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Design Functions and Procedures . . . . . . . . . . . . .   6
   5.  Configuration Parameters  . . . . . . . . . . . . . . . . . .   7
   6.  Design Enhancement and Implementation . . . . . . . . . . . .   8
     6.1.  HPCC++ Guidelines . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Receiver-based HPCC . . . . . . . . . . . . . . . . . . .   9
     6.3.  Switch-side Optimizations . . . . . . . . . . . . . . . .  10
   7.  Reference Implementations . . . . . . . . . . . . . . . . . .  10
     7.1.  INT padding at switches . . . . . . . . . . . . . . . . .  11
     7.2.  Congestion control at NICs  . . . . . . . . . . . . . . .  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     12.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   The link speed in data center networks has grown from 1Gbps to
   100Gbps in the past decade, and this growth is continuing.  Ultralow
   latency and high bandwidth, which are demanded by more and more
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