You Ain't SPDY - Speaker Deck

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You Ain't SPDY Chris Strom (@eee_c) GoGaRuCo 2011-09-16

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@spdybook @backbonerecipes w/ Nick Gauthier

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SPDY is a replacement for HTTP

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SPDY is backwards compatible with HTTP

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SPDY still does HTTP-like things

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SPDY is optimized for page load times

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A Tale of Two Websites by httparchive.org

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38% of broadband users will close a site if it doesn't respond in 4 seconds

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38% of broadband users will close a site if it doesn't respond in 4 seconds (precision is the key to any good statistic)

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= $$$

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That's freaking crazy

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Site #2...

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took 4.2 seconds to load 469kB of data over 75 requests

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took 4.2 seconds to load 469kB of data over 75 requests took ??? seconds to load 806kB of data over 83 requests

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took 4.2 seconds to load 469kB of data over 75 requests took ??? seconds to load 806kB of data over 83 requests Average: 816kB of data over 83 requests

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How does Amazon do it?

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But wait! There's more...

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Got all that?

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HTTP Optimizations

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!HTTP Optimizations

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!HTTP Optimizations HTTP Workarounds

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HTTP is antiquated

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HTTP is antiquated HTTP has not been updated in 12 years

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HTTP is antiquated HTTP has not been updated in 12 years HTTP is old

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HTTP is antiquated HTTP has not been updated in 12 years HTTP is old HTTP is so old...

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SPDY!

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SPDY! It offers no new ideas!

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Bandwidth Will Save US!

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Bandwidth Will Save US! (won't it?)

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Bandwidth Doesn't Matter

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Bandwidth Doesn't Matter Beyond ~3mpbs, it make no difference on page load.

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Bandwidth is for Downloading Ubuntu (not the Ubuntu download page)

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SPDY is About Page Load Time It has other benefits, but its main goal is to decrease page load time

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The Internet is built of tubes...

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Data travels One Way thru HTTP Tubes (kinda like a stargate)

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HTTP Tubes in Action

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Problem Solved

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Problem Solved ?

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Brrr..! Connections Need to be Warmed thermometer indicating cold temperature

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Warm Connections == Higher Bandwidth

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Why Not Start the Tubes Warm? ● Large congestion window (CWND) ● CWND is initially 3 ● 6 connections => we already have 18 initial CWND

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Why Not Start the Tubes Warm? ● Large congestion window (CWND) ● CWND is initially 3 ● 6 connections => we already have 18 initial CWND ● Already subverting TCP/IP ● Is subverting further a good idea? ● Especially given data loss rates that we already see?

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SPDY Tube...!

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SPDY Conversations...!

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SPDY ● Built on SSL ● Binary ● Don't send redundant header information ● Aggressively compress stuff ● Use a single(!) tube ○ Only pay the warm-up penalty once ○ Just like downloading an Ubuntu ISO!!!

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SPDY ● SYN_STREAM ● SYN_REPLY ● RST_STREAM ● SETTINGS ● HEADERS ● PING ● GOAWAY ● WINDOW_UPDATE ● DATA

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Current State of SPDY in Ruby In a word....

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Current State of SPDY in Ruby In a word.... Ugh.

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● An openssl-generated server key ● The SPDY Gem ● Edge-openssl for NPN (Next Protocol Negotiation) ● Carson McDonald's NPN enabled fork of eventmachine* (in the tls-npn branch) — pull request #196 * https://github.com/carsonmcdonald/eventmachine

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https://github.com/igrigorik/spdy/issues/2

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If browsers had a single connection...

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Closer to Real Browser Connections

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Packaging/Compressing Responses

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SPDY Server Push

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SPDY Server Push Pushes data directly into the browser cache

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Client Request (SYN_STREAM) +----------------------------------+ 80 02 00 01 |1| Version | 1 | +----------------------------------+ 02 00 00 38 | Flags (8) | Length (24 bits) | +----------------------------------+ 00 00 00 01 |X| Stream-ID (31bits) | +----------------------------------+ 00 00 00 00 |X|Associated-To-Stream-ID (31bits)| +----------------------------------+ 00 00 62 60 | Pri | Unused | | +------------------ | 64 60 06 05 | Name/value header block | 81 42 46 49 | ... | 49 41 b1 95 ....

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Server Response (SYN_REPLY) +----------------------------------+ 80 02 00 02 |1| Version | 2 | +----------------------------------+ 00 00 00 a4 | Flags (8) | Length (24 bits) | +----------------------------------+ 00 00 00 01 |X| Stream-ID (31bits) | +----------------------------------+ 00 00 78 bb | Unused | | df a2 51 b2 +---------------- | 62 e0 64 e0 | Name/value header block | 42 c4 10 03 | ... | 57 76 6a 6a

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Server Push (SYN_STREAM) +----------------------------------+ 80 02 00 01 |1| Version | 1 | +----------------------------------+ 02 00 00 51 | Flags (8) | Length (24 bits) | +----------------------------------+ 00 00 00 02 |X| Stream-ID (31bits) | +----------------------------------+ 00 00 00 01 |X|Associated-To-Stream-ID (31bits)| +----------------------------------+ 00 00 62 60 | Pri | Unused | | +------------------ | | Name/value header block | 23 c2 37 cc | ... | a0 40 52 c8 28 29 29 28

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SPDY Server Push

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SPDY Server Push

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SPDY Server Push

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SPDY Server Push

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SPDY Server Push

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Server Push #2 (SYN_STREAM) +----------------------------------+ 80 02 00 01 |1| Version | 1 | +----------------------------------+ 02 00 01 5b | Flags (8) | Length (24 bits) | +----------------------------------+ 00 00 00 04 |X| Stream-ID (31bits) | +----------------------------------+ 00 00 00 01 |X|Associated-To-Stream-ID (31bits)| +----------------------------------+ 00 00 62 60 | Pri | Unused | | +------------------ | | Name/value header block | 23 c2 37 cc | ... | a0 40 52 c8 28 29 29 28

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SPDY Server Push

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SPDY Server Push

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SPDY Server Push

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SPDY Server Push

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SPDY Server Push

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took 11.4 seconds to load 806kB of data over 83 requests

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Thanks! Chris Strom (@eee_c) spdybook.com Coupon: gogaruco2011 (free!) Coming soon! Recipes with Backbone(.js) recipeswithbackbone.com