1. WWW and World Wide Wait: Is it Forever? Hanoch Levy School of Computer Science Tel-Aviv University November 2000

2. World Wide Wait www.xyz.com

3. Questions (W*) Do We Wait? Where We Wait? When We wait? hoW much We Wait? Why We Wait? Why Telephone is so great and Web is not? Will We Wait?

4. Waiting in Israel Our experience: long… Short Experiment: –Several sites at non-peak time –70 KB pages –ISDN line (8 Kbytes/sec) –Avg wait time : 15 seconds –Peak time: worse

5. Waiting in the World (US) Source: An index of 40 leading Business Web site home pages down-load time (Keynote) Method: – Monday -Friday every 15 minutes between 6 am and noon Pacific time –Around 50 agents located in metropolitan areas of the United States.

6. Good News Index of Keynote Business 40 1999-2000

7. Better(?) News Keynote Index of Business 40 1998-99

8. Butt… Keynote Index of Consumer 40 – current

9. How come? Source: An index of 40 leading Consumer Web site home pages down-load time. Method: –Sunday – Saturday, every 1 hour, between 5Am to 9Pm pacific time. –Around 50 agents in US. Difference: Sites + peak time

10. Comparison consumer vs. business

11. Where is the problem? Used to put the blame on the modem speed. Now modems are faster Problem is moving into the net: –Internet service providers –Backbones –Mostly at switches

12. “Bandwidth like Water”? Claims (already 2-3 years old): –We have coming ADSL/Cable, Fiber Optics, WDM, Tera-bits,…. –“bandwidth like water”  no problem.

13. Answers They are here and still we wait… “Free resource” paradox: –If a resource is “free”, its doomed to be consumed! –NAPSTER + alike: Program to download songs/videos from other computers (share). 1 song = 60-100 Web pages!! Traffic takes 30% or more in some places (universities).

14. How Come Telephone is so great? Telephone : –old –Very uniform (all calls are alike) –Bounded (one cannot talk more than 24 hours/day) –System polices customers. Web: –New and dynamic –Services vary heavily (telephony, web, email, files). –User can request 100 Mbytes in a few clicks. –Little accountability (encourages greediness [pre-fetch]).

15. How Come Telephone is so great? (2) Telephone : –Smooth traffic Web: –Very bursty traffic –Self-Similar / long tail –One request can generate a lot of data!!! –Need special controls! t t

16. What is needed? 1) Separate and prioritize applications –E.g.: voice > Web > Email. 2) Users / applications should be accountable –Cannot ask the network to bring you 100 songs “for free”. –Will the $20/ month service fee hold?

17. What is being done today? Much activity (umbrella of Quality of Service) Current solutions: –Partial (part of the net) –Separation and prioritization –Accountability? Much forward looking work

18. Back to Questions Do We Wait? YES! Where We Wait? Here, US,… When We wait? Consumer-time, variable!!! hoW much We Wait? Yet, too much Why We Wait? Little control Why Telephone is so great and Web is not? Will We Wait? At least for a while..

19. The End

20. Keynote Index of Business 40 1997-1998

21. Detailed Comparison (in seconds) businessconsumer Yahoo.674.74 Lycos1.066.76 Apple1.21 Schwab1.308.46 FedEx1.54 Worst9.845.47 Index (avg 40)3.2816.84

22. Detailed time measures