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Doing Horrible Things to DNS in the Name of Science - SF Performance Meetup
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Doing Horrible Things to DNS in the Name of Science - SF Performance Meetup

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  • 1. Doing Horrible Things to DNS (in the name of science) @sh1mmer SF Perf Meetup Thursday, September 23, 2010
  • 2. The basics of DNS Thursday, September 23, 2010
  • 3. Thursday, September 23, 2010
  • 4. Thursday, September 23, 2010
  • 5. Thursday, September 23, 2010
  • 6. Thursday, September 23, 2010
  • 7. Thursday, September 23, 2010
  • 8. San Francisco - Mission Branch Thursday, September 23, 2010
  • 9. Thursday, September 23, 2010
  • 10. Thursday, September 23, 2010
  • 11. San Francisco - Main Library Thursday, September 23, 2010
  • 12. Thursday, September 23, 2010
  • 13. Thursday, September 23, 2010
  • 14. New York City - 5th & 42nd Branch Thursday, September 23, 2010
  • 15. Thursday, September 23, 2010
  • 16. Thursday, September 23, 2010
  • 17. New York City - 5th & 42nd Branch Thursday, September 23, 2010
  • 18. Thursday, September 23, 2010
  • 19. San Francisco - Main Library Thursday, September 23, 2010
  • 20. San Francisco - Main Library Thursday, September 23, 2010
  • 21. Thursday, September 23, 2010
  • 22. San Francisco - Mission Branch Thursday, September 23, 2010
  • 23. San Francisco - Mission Branch Thursday, September 23, 2010
  • 24. Thursday, September 23, 2010
  • 25. Thursday, September 23, 2010
  • 26. Thursday, September 23, 2010
  • 27. Thursday, September 23, 2010
  • 28. DNS for performance Thursday, September 23, 2010
  • 29. Page Load Time vs. Bandwidth Thursday, September 23, 2010
  • 30. Page Load Time vs. Round Trip Time Thursday, September 23, 2010
  • 31. Trend Curves for Bandwidth vs. RTT Thursday, September 23, 2010
  • 32. Serial HTTP loading Thursday, September 23, 2010
  • 33. Parallel HTTP loading Thursday, September 23, 2010
  • 34. Why not just use a bunch of domains? Thursday, September 23, 2010
  • 35. DNS Querying Thursday, September 23, 2010
  • 36. Ideal? 1 domain many threads Thursday, September 23, 2010
  • 37. Option 1: SPDY Thursday, September 23, 2010
  • 38. Good: Multi-thread TCP connections Bad: Only works on Chrome Thursday, September 23, 2010
  • 39. Option 2: Do horrible things to DNS Thursday, September 23, 2010
  • 40. Good: Works now Bad: Might have to violate RFCs Thursday, September 23, 2010
  • 41. Option 2a - Mucking about with C names Thursday, September 23, 2010
  • 42. CNAMES are hosts which are aliases of other hosts Thursday, September 23, 2010
  • 43. ajax1.hackerhouse.org. 1800 IN CNAME ajax2.hackerhouse. ajax2.hackerhouse.org. 1800 IN CNAME ajax3.hackerhouse. ajax3.hackerhouse.org. 1800 IN CNAME ajax4.hackerhouse. ajax4.hackerhouse.org. 1800 IN CNAME ajax5.hackerhouse. ajax5.hackerhouse.org. 1800 IN CNAME ajax.hackerhouse. ajax.hackerhouse.org. 1800 IN A 127.0.0.1 Thursday, September 23, 2010
  • 44. We now have 6 hostnames Thursday, September 23, 2010
  • 45. Good: 6 hostnames Bad: Inflexible Thursday, September 23, 2010
  • 46. Option 2b - Doing weird things with RRs Thursday, September 23, 2010
  • 47. RR is the section of a DNS response which contains the HOST records Thursday, September 23, 2010
  • 48. ;; QUESTION SECTION: ;ajax.hackerhouse.org. IN A ;; ANSWER SECTION: ajax.hackerhouse.org. 60 IN A 184.106.231.91 Thursday, September 23, 2010
  • 49. ;; QUESTION SECTION: ;ajax.hackerhouse.org. IN A ;ajax1.hackerhouse.org. IN A ;ajax2.hackerhouse.org. IN A ;; ANSWER SECTION: ajax.hackerhouse.org. 60 IN A 184.106.231.91 ajax1.hackerhouse.org. 60 IN A 184.106.231.90 ajax2.hackerhouse.org. 60 IN A 184.106.231.89 Thursday, September 23, 2010
  • 50. ;; QUESTION SECTION: ;ajax.hackerhouse.org. IN A ;; ANSWER SECTION: ajax.hackerhouse.org. 60 IN A 184.106.231.91 ;; ADDITIONAL SECTION: ajax1.hackerhouse.org. 60 IN A 184.106.231.90 ajax2.hackerhouse.org. 60 IN A 184.106.231.89 Thursday, September 23, 2010
  • 51. Good: Flexible Bad: Caching /Violating RFCs Thursday, September 23, 2010