1. WW Last Mile End-User Instrumentation Data Aladdin A. Nassar Hotmail & Windows Live Perf Champ Hotmail, Microsoft

2. The New Hotmail – Inbox

3. Hotmail’s Scale  1.3 Billion accounts ~ 600 Million active users  50 Billion page views / month  21 Billion e-mails Read / month  2.5 Billion e-mails Sent / month  Move 5.5 PB of data / month around the internet

4. What is CSI Perf?  Built-in WW Last Mile End-User Perf  Global OnClick event handler  Shared Control across WL network  BI/CI + Perf instrumentation

5. What is CSI Perf? …  Sampling Frequency  Cookies – works for Postbacks / Ajax  Server-Side Headers  Sends information through QS

6. CSI Perf Measures  Timings: -Time to Glass -Page Load Time -Between any 2 points  Network Latency  Bandwidth  Cached / Uncached Detection

7. CSI Perf is aware of  Date/Time  Transaction (From / To)  User’s Country  Data Center, Cluster, SKU  OS  Browser

8. How CSI Perf measures …  Network Latency: -Tiny uncahed HTTP “ping”  Bandwidth: -Time to load a clustered image (PLT1/2) -Read / Send E-mails (Uncompressed) -Upload Attachments (Compressed)

9. WW Network Latencies (NL) Source: CSI Perf 500 Million Data Points from Jan 2009 – June 2010

10. WW Bandwidths (BW) Source: CSI Perf 3.5 Billion Data Points from Jan 2009 – June 2010

11. WW Page Load Time – Composite Source: CSI Perf 7 Billion Data Points from Jan 2009 – June 2010

12. WW Perf Index = BW + NL + PLT

14. Countries Governed by Network Latencies Countries Governed by Bandwidth

15. Which Governs NL or BW?

16. WW DNS & TCP Source: Bing Toolbar 950 Million Data Points from May/June 2010

17. WW TCP vs. TTFB Source: Bing Toolbar 950 Million Data Points from May/June 2010

18. Composite PLT Ratio by Browser Source: CSI Perf 6.7 Billion Data Points from Jan 2009 – June 2010 It turns out Safari fires the Page Onload event earlier than other browsers

19. Composite PLT Ratio by OS Source: CSI Perf 8.3 Billion Data Points from Jan 2009 – June 2010

20. WW Last Mile End-User Instrumentation Data Aladdin A. Nassar Hotmail & Windows Live Perf Champ Hotmail, Microsoft