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Tom Croucher
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Doing Horrible Things to DNS (in the name of science) @sh1mmer SF Perf Meetup Thursday, September 23, 2010
The basics of DNS Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
San Francisco - Mission Branch Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
San Francisco - Main Library Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
New York City - 5th & 42nd Branch Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
New York City - 5th & 42nd Branch Thursday, September 23, 2010
Thursday, September 23, 2010
San Francisco - Main Library Thursday, September 23, 2010
San Francisco - Main Library Thursday, September 23, 2010
Thursday, September 23, 2010
San Francisco - Mission Branch Thursday, September 23, 2010
San Francisco - Mission Branch Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
Thursday, September 23, 2010
DNS for performance Thursday, September 23, 2010
Page Load Time vs. Bandwidth Thursday, September 23, 2010
Page Load Time vs. Round Trip Time Thursday, September 23, 2010
Trend Curves for Bandwidth vs. RTT Thursday, September 23, 2010
Serial HTTP loading Thursday, September 23, 2010
Parallel HTTP loading Thursday, September 23, 2010
Why not just use a bunch of domains? Thursday, September 23, 2010
DNS Querying Thursday, September 23, 2010
Ideal? 1 domain many threads Thursday, September 23, 2010
Option 1: SPDY Thursday, September 23, 2010
Good: Multi-thread TCP connections Bad: Only works on Chrome Thursday, September 23, 2010
Option 2: Do horrible things to DNS Thursday, September 23, 2010
Good: Works now Bad: Might have to violate RFCs Thursday, September 23, 2010
Option 2a - Mucking about with C names Thursday, September 23, 2010
CNAMES are hosts which are aliases of other hosts Thursday, September 23, 2010
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
We now have 6 hostnames Thursday, September 23, 2010
Good: 6 hostnames Bad: Inflexible Thursday, September 23, 2010
Option 2b - Doing weird things with RRs Thursday, September 23, 2010
RR is the section of a DNS response which contains the HOST records Thursday, September 23, 2010
;; QUESTION SECTION: ;ajax.hackerhouse.org. IN A ;; ANSWER SECTION: ajax.hackerhouse.org. 60 IN A 184.106.231.91 Thursday, September 23, 2010
;; 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
;; 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
Good: Flexible Bad: Caching /Violating RFCs Thursday, September 23, 2010

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