Agenda (Rev 2)
Week 5: Congestion vs. QoS Coping with Rush Hour on the Info Highway
But first… it’s time for more Gray’s Networking Nuggets
Part 1: The Performing Arts
Performance Metrics
Delay vs. Bandwidth
Measuring Throughput
Burstiness
Performance Elements
Policies vs. Performance (Jain)
Other Performance Factors…
Part 2: Congestion Obsession
Decreasing Offered Load
Not a new problem…
Flow vs. Congestion Control
Load Shedding aka Discard Policy
Queuing Disciplines (packet scheduling)
Taxonomy #1 (Zhang)
Taxonomy #2 (Yang & Reddy)
Evaluation
Implicit Feedback
Explicit Feedback
Congestion Avoidance
Two Examples
TCP Flow/Congestion Control
TCP Performance vs. Loss Curtis Villamizar
Layer Interactions
Part 3: Better than “Best Effort” Integrated Services & Bandwidth-on-Demand
Making little pipes from big ones -Bandwidth sharing, but how dynamic?
Switching Techniques redux
Real-Time Applications
QoS Application Examples
QoS Goals
QoS: How much is enough?
QoS: There is no Free Lunch
QoS Elements/Strategies
Flow Specifications
Example Flow Spec (RFC1363)
Traffic Shaping
ATM Service Classes
RSVP Service Classes
RSVP Design Goals
RSVP Design Principles
Alternative Transport: RTP
ATM “Flow” Control
Peterson&Davie Comparison of RSVP & ATM
Open QoS Issues
QoS Alternatives
Questions?
Email: cse588@cs.washington.edu
Home Page: http://www.cs.washington.edu/education/courses/cse588/97sp/
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