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 |