High Performance Networking

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Vignesh Shanmugam

Deep dive in to Networking, SPDY, HTTP and Performance

High Performance
Networking

Players
DNS
TCP
TLS
HTTP
ISP
Proxies

Need Care
Latency Everywhere
TCP Slow Start
3-Way Handshake
SSL Negotiation
Congestion Control
Flow Control
Buffer Bloat
SPOF

How to fix these - Network
CDN
OCSP
HSTS
Tuning TCP slow start/ Tunnelling
TLS False start
Session Resumption/Tickets
Tuning content window size

Fix - FrontEnd
Pipelining/Domain Sharding
Minify/Concat/Obfuscate
Gzip
CSS Sprites
Image Optimisation - Image Optim
Enough - Follow Y-Slow Rules :D

SPDY
Needs TLS
Multiplexing
Resource Priority - Buggy
Header Compression - Only Response
Server Push
Flow Control - Not Much
NPN

HTTP/2
Flow Control - Per Frame
Multiplexing
Server Push
Resource Prioritisation
HPACK - Req & Resp
ALPN
Best Part - Extensions
Operates with/without TLS

Changes
Concat/Minify
CSS/Image Sprites
Domain Sharding
Resource Priorities - Use Heavily
Rest follows

Tools
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Wireshark/Packer-Peeper
Dig/traceroute
DNS-Analyser
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InitCwnd Check
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High Performance Networking

1. High Performance Networking

2. Players DNS TCP TLS HTTP ISP Proxies

3. Need Care Latency Everywhere TCP Slow Start 3-Way Handshake SSL Negotiation Congestion Control Flow Control Buffer Bloat SPOF

4. How to fix these - Network CDN OCSP HSTS Tuning TCP slow start/ Tunnelling TLS False start Session Resumption/Tickets Tuning content window size

5. Fix - FrontEnd Pipelining/Domain Sharding Minify/Concat/Obfuscate Gzip CSS Sprites Image Optimisation - Image Optim Enough - Follow Y-Slow Rules :D

6. SPDY Needs TLS Multiplexing Resource Priority - Buggy Header Compression - Only Response Server Push Flow Control - Not Much NPN

7. HTTP/2 Flow Control - Per Frame Multiplexing Server Push Resource Prioritisation HPACK - Req & Resp ALPN Best Part - Extensions Operates with/without TLS

8. Changes Concat/Minify CSS/Image Sprites Domain Sharding Resource Priorities - Use Heavily Rest follows

9. Tools Webpagetest Wireshark/Packer-Peeper Dig/traceroute DNS-Analyser Devtools Network Tab InitCwnd Check PageSpeed

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