Pp. 189–202 of the Proceedings

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Kernel Mechanisms for Service Differentiation in Overloaded Web Servers

Thiemo Voigt¹
Swedish Institute of Computer Science
thiemo@sics.se
Renu Tewari
IBM T.J. Watson Research Center
tewarir@us.ibm.com
Douglas Freimuth
IBM T.J. Watson Research Center
dmfreim@us.ibm.com
Ashish Mehra
iScale Networks
ashish@iscale.net

• Abstract
• Introduction
• Input Packet Processing: Background
• Architecture Design
  • SYN Policer
  • Prioritized Listen Queue
  • HTTP Header-based Controls
  • Filter Specification
  • Protocol Stack Architecture
  • Implementation Methodology and Testbed
• Experimental Results
  • Efficacy of SYN Policing
  • Impact of Burst Size
  • Prioritized Listen Queue: Simple Priority
  • Combining Policing and Priority
  • HTTP Header-based Connection Control
    • Overload Protection from High Overhead Requests
    • Discussion
  • Overhead of the Kernel Mechanisms
• Comparison of User Space and Kernel Mechanisms
• Related Work
• Conclusions and Future Work