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On the Use and Performance of Content Distribution Networks. Balachander Krishnamurthy Craig Wills Yin Zhang. Presenter: Wei Zhang CSE Department of Lehigh University. What are Content Distribution Networks?.

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on the use and performance of content distribution networks

On the Use and Performance of Content Distribution Networks

Balachander Krishnamurthy

Craig Wills

Yin Zhang

Presenter: Wei Zhang

CSE Department of Lehigh University

what are content distribution networks
What are Content Distribution Networks?
  • Content distribution networks (CDNs) are a mechanism to deliver content to end users on behalf of origin Web sites.
  • Content distribution offloads work from origin servers by serving some or all of the contents of Web pages.
cdn techniques
CDN Techniques
  • DNS redirection
    • Full-site content delivery
      • The origin server modifies its DNS zone file;
      • The CDN server either serves the content from its cache or forwards on the request to origin server.
    • Partial-site content delivery (primarily for images)
      • i.e. www.foo.com/bar.gif -> foo.speedera.net/www.foo.com/bar.gif
  • URL rewriting
    • An origin server dynamically rewrites URL links in generated pages to redirect clients to different content servers.
use of content distribution networks
Use of Content Distribution Networks
  • Change Characteristics of CDN-Served Content
    • CDNs are serving little dynamically generated content that is actually changing on each access.
use of content distribution networks1
Use of Content Distribution Networks
  • Nature of HTTP-Request CDN content
    • Images account for 96~98% of the CDN-served objects, but only 40~60% of the CDN-served bytes.
    • Among the CDNs, Akamai servers over 85~98% of the CDN-served objects in the proxy logs and a comparable range of the CDN-served bytes.
performance of cdns
Performance of CDNs
  • Response Time Results
performance of cdns1
Performance of CDNs
  • Performance for individual clients
performance of cdns2
Performance of CDNs
  • DNS load balancing
performance of cdns3
Performance of CDNs
  • DNS load balancing
conclusion
Conclusion
  • Most CDNs provide better download performance for the U.S. clients than the U.S. origin sites.
  • CDNs should increase the DNS TTL given to a client unless the servers are known to be loaded.