Steve Lerner presents at ThousandEyes Connect on how eBay measures and optimizes web performance, CDNs and DNS infrastructure.

1. THOUSANDEYES
CONNECT
MAY 13, 2015
STEVE LERNER, SENIOR MEMBER OF TECHNICAL STAFF

2. ABOUT EBAY
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eBay Marketplace
• Massive
• 800M listings, 24M sellers, 157M active buyers, $83B Annual
Gross Merchandise Volume
• Tens of billions of hits per day
• Mobile
• Substantial percentage use mobile app
• Global
• Over 50% of business from outside of USA

3. EBAY INFRASTRUCTURE
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• Utah Datacenter:
– Primary Power: Bloom Energy Fuel Cells: 1mw In 24 Racks
– Densest Modular Datacenter (Built With Dell): 24 rack positions @ 1MW power
– Largest Modular Datacenter (Built with HP): 44 racks @ 1.4 MW power

4. OPTIMIZING CDN / WEB PERFORMANCE
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Front End Optimization
• Classic Techniques (defer ads, minify JS, unshard)
DNS
• Global DNS (Dyn)
• Reduce number of domains
Content Delivery Networking
• Static Objects
• Cache everything
• Tune CDN cache based on re-use frequency
• Dynamic Objects
• Cache if possible
• Proxy

5. EBAY SPEED TEAMS
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Diverse Group Across Company Tackle Speed
• CDN – operate CDN and drive new technology
• Platforms – enable internal components to be CDN / speed ready
• Measurement – develop and integrate measurement tools
• Media Services – delivery and optimize images and video
• Mobile – own entire mobile stack

6. USING THOUSANDEYES AT EBAY
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• Key Infrastructure Components i.e.
– DNS Servers
– Load balancers
• Site Speed
– www.ebay.com
– Deals.ebay.com
– Specific markets i.e. www.ebay.co.uk
• Before/After Testing: CDN etc.

7. USE CASE: ENABLE GLOBAL DNS
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Min Overall 50%
Improvement In All
Regions But LATAM
(25%)
DynDNS
Added
Here

8. USE CASE: ENABLE GLOBAL DNS
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50% Reduction In Page Load Time On Key Page
Measured From ThousandEyes Agents
50% Reduction In DNS Lookup
Time Measured From
ThousandEyes, Germany

9. USE CASE: SITE PERFORMANCE ANALYSIS
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www.ebay.com Pools
Telia
Slowness

10. USE CASE: CDN TESTING
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www.ebay.de
Measured From Germany
www.ebay.de
Measured From All
Agents
Pre/Post Enabling
CDN Proxying

11. USE CASE: BGP HEALTH
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Keeping An Eye
On Routes

12. COMING SOON
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• Alerting in NOC
• Research of internet health problems
• Private agents

13. TIPS
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• Triangulate
– Use RUM, Synthetic Testing, and Log Analysis
• Be Aware
– Understand the details of the payload of your site / app
• Build Measurement Hooks Into Mobile Apps
???

14. THANK YOU
STEVE LERNER
SENIOR MEMBER OF TECHNICAL STAFF
SLERNER@EBAY.COM