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AMRT: Anti-ECN Marking to ImproveUtilization of Receiver-driven Transmission
in Data Center
The 49th International Conference on Parallel Processing (ICPP 2020)
Jinbin Hu1 , Jiawei Huang1, zhaoyi Li1, Jianxin Wang1, Tian He2
1Central South University, China2University of Minnesota, USA
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
Introduction
n Key idea:Improve link utilization in receiver-driven transmission under
multi-bottleneck and dynamic traffic scenarios.
n Solution:AMRT uses anti-ECN marked packets to notify the sender of
link under-utilization and correspondingly increases sending rateto grab spare bandwidth.
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
Background
n Data Center (DC)
Leaf
Spine
10/100G
Hosts
n Data Center Trafficn delay-sensitive flows
n throughput-sensitive flows
n Transport protocols n Sender-driven (DCTCP[1], D2TCP[2], pFabric[3] , DCQCN[4] ,Timely[5])
n Receiver-driven (pHost[8], NDP[10], Homa[7] , Aeolus[11] )
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
Motivation
n Multiple bottlenecks scenario
Motivation
n Dynamic traffic scenario
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
n AMRT Overview
AMRT: Anti-ECNMarking Receiver-drivenTransmission
n At switch
n At receiver
n At sender
AMRT: Design Details
n At switchn Packet Interval Estimation
n Anti-ECN Marking
AMRT: Design Details
n At receivern Grant Generation
n Explicit Feedback
n At sendern Receiver-driven Rate Adjustment
AMRT: Model Analysis
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
n Testbed settingsn 2-layer Leaf-spine topology;n 1Gbps bottleneck link;
Testbed Results
n Testbed settingsn 2-layer Leaf-spine topology;n 1Gbps bottleneck link;
Testbed Results
Larger-scale Simulationsn Simulation settings
n NS2 simulator; 2-layer Leaf-spine topologyn 10Gbps bottleneck link; 400 hosts, 10 ToR switches, 8 core switches
better
Reducing the AFCT up to ~49% Reducing the 99th FCT up to ~56%
Larger-scale Simulationsn Simulation settings
n NS2 simulator; 2-layer Leaf-spine topologyn 10Gbps bottleneck link; 400 hosts, 10 ToR switches, 8 core switches
Improving the link utilization up to ~36%
better
Larger-scale Simulations
n PerformanceinMany-to-many Communications
Improving the link utilization up to ~60%
better
better
Outline
n Introductionn Backgroundn Motivationn AMRT Designn Evaluationn Summary
Summary
n Conservative receiver-driven transmissionn Under-utilization in Multiplebottlenecksscenario;n Under-utilization in Dynamictraffic scenario;
n Challenges for AMRTn How to detect and feedback the under-utilization information to senders to
improvelinkutilization and guarantee ultra low latency simultaneously?
n Key points of AMRTn PacketIntervalEstimationandAnti-ECN Marking at switches；n GrantGenerationandExplicitFeedback at receivers;n Receiver-drivenRateAdjustment at senders.
Q&A
