Performance%20Guarantees%20for%20Web%20Server%20End-Systems:%20A%20Control-Theoretical%20Approach

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Performance Guarantees for Web Server
End-Systems A Control-Theoretical Approach

• Abdelzaher, Shin, Bhatti

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Whats It All About

• Applying Control Theory to QoS

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What Do They Do?
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How Do They Do It?

• Feedback Control
• Using Content Adaptation (Level of Detail)
• Stratified Service

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What Is Feedback Control?
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What Do You Need For Feedback Control?

• Sensors / Actuators
• Model

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Sensors

• served request rate
  delivered byte bandwidth

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Actuators

• Admission control
• Degradation of client QoS

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Transfer Function (The Model)
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Does It Work?
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How Does This Apply To AC?

• Self-optimization
• Self-maintenance?
• Heuristics vs. Control Theory