Forward Explicit Congestion Notification (FECN) for Datacenter Ethernet Networks


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Table of Contents

Forward Explicit Congestion Notification (FECN) for Datacenter Ethernet Networks

Overview

Datacenter Networks

Goals of FECN

FECN Overview

FECN: Observations

Switch Algorithm

The Basic Switch Algorithm

Enhancement 1: Queue-Control

Queue Control Function: f(q)

Enhancement 2: Exponential Averaging

Enhancement 3: Limited Rate Increase

Enhancement 4: Variable Capacity Adjustment

Enhancement 5: Time Based Sampling

General Simulation Parameters

Baseline Simulation Results

FECN with TCP flows

Simulation Results

Symmetric Topology: Configuration

Symmetric Topology: Source Throughput

Symmetric Topology: Queue Length

Symmetric Topology: Link Utilization

Simple Topology, 400us Delay

Symmetric Topology LD: Source Throughput

Symmetric Topology LD: Queue Length

Sym. Topology LD: Link Utilization

Large Topology: Configuration

Large Topology: Source Rates

Large Topology: Link Utilization

Large Topology: Queue Length

PAUSE

Bursty Traffic: Configuration

Large Topology - Bursty Traffic: Througput

Large Topology - Bursty Traffic: Link Utilization

Large Topology - Bursty Traffic: Queue

Output Generated Hotspot Scenario

OGHS – Uncongested Link (ST2 to CS)

OGHS – Congested Link (CS to ST0)

OGHS – 9 Congested Flows

OGHS - Queue Length

OGHS – Long Delay

OGHS-LD: Uncongested Link - ST2 to CS

OGHS-LD: Congested Link (CS to ST0)

OGHS-LD: 9 Congested Flows

OGHS-LD: Queue Length

OGHS-LD: Other Observations

Minimum Buffering Required w Pause

Sensitivity Analysis

N0=100

N0=80

N0=40

N0=20

Sensitivity to N0

Overhead of FECN

Advantages of FECN

Summary

Author: Jinjing

Home Page: http://www.cse.wustl.edu/~jain/

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