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Using Multiple Interfaces for Serving High QoS Demands

Using Multiple Interfaces for Serving High QoS Demands. ECS256: Performance Evaluation Prof. Dipak Ghosal Atif Nazir Jonathan Wagoner December 14, 2007. Outline. Motivation Problem Description Scheduling Schemes Scheme Comparison Future Work. Motivation.

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Using Multiple Interfaces for Serving High QoS Demands

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  1. Using Multiple Interfaces for Serving High QoS Demands ECS256: Performance Evaluation Prof. Dipak Ghosal Atif Nazir Jonathan Wagoner December 14, 2007

  2. Outline Motivation Problem Description Scheduling Schemes Scheme Comparison Future Work

  3. Motivation • Usage of the Internet over Television is becoming the primary source for media, news, and streaming media. Many of these and other high-bandwidth applications have QoS constraints. • Many mobile and other devices have more than one physical connection to a network. • In some cases, the speed of that physical connection is less than the speed of the network. • How can we use multiple physical interfaces to “switch up” or “switch down” traffic, on an opportunistic basis, to meet QoS demands?

  4. Problem Description • Two NICs, each with combined capacity 2µ. • One app. requests data from both NICs. • Want to maximize bandwidth exploitation. • How to schedule requests between NICs?

  5. Scheduling Schemes for Comparison • Case 1: One NIC with 2µ service rate • Case 2: Round-Robin Scheduling on two NICs with service rates µ1, µ2 s.t. µ1+ µ2 = 2µ

  6. Scheduling Schemes for Comparison • Case 3: Quasi-Round-Robin Scheduling on two NICs with service rates µ1, µ2 s.t. µ1+ µ2 = 2µ • Case 4: Minimal Scheduling on two NICs with µ1, µ2 s.t. µ1+ µ2 = 2µ, and µ1 >= µ2

  7. Best Case • Round-Robin • Quasi Round-Robin • Worst Case • X-Axis: Arrival Rate, λ • Y-Axis: Avg. Wait Time

  8. Future Work • Use different arrival and service rates than Poisson. • Use G/M/1/∞ queue for Worst-Case. • Simulations.

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