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Delay Tolerant Bulk Data Transfers on the Internet

Delay Tolerant Bulk Data Transfers on the Internet. Offense Marcel Flores, Alok Rakkhit. The Proposition . Present a method of doing large transfers over the internet Eliminate high link costs Eliminate need for couriers Don’t damage QoS for interactive users

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Delay Tolerant Bulk Data Transfers on the Internet

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  1. Delay Tolerant Bulk Data Transfers on the Internet • Offense • Marcel Flores, Alok Rakkhit

  2. The Proposition • Present a method of doing large transfers over the internet • Eliminate high link costs • Eliminate need for couriers • Don’t damage QoS for interactive users • Seems like a reasonable goal...

  3. The Solutions • E2E-sched • Use intelligent scheduling to transfer in the off-hours • SnF • Store and forward within the TR

  4. So how does it look? • With their straightforward analysis...it seems to work • Report that it beats the cost of couriers • Pretty graphs • SnF works well in places where E2E-sched has problems...

  5. ... • Well. Yeah. • The whole idea is pretty obvious • If you transfer when there are no others on, you can transfer more, faster • Working around time zones is not complex either...

  6. Assumptions • Assume each direction of traffic charged independently • No delay in TR • Always possible to have in-TR storage • How reasonable are these? Any real data?

  7. Some fundamentals • E2E-sched • Has clear limitations (>5 time zone difference results in poor performance) • SnF • Are resources always available? • Does the placement affect the performance?

  8. The Experiment • Wait what experiment? • They just used these formulas to compute the available bandwidth! • They didn’t actuallytransfer any data. • How do they know it will work that well!

  9. Other Comparisons • Why is this better than some of the specialized protocols • Even though they have different design goals, still worth a side by side • QBSS - QBone scavenger

  10. Applicability? • Who can use this? • Fine tuning likely depends on special information • ISPs probably don’t want to share that information • Could result in poorly tuned systems

  11. Robust? • Minute changes in ISP policy could do significant harm • Combination percentile/volume pricing • Other traffic shaping • Increased Traffic? • If this becomes popular

  12. ...but again! • We don’t even know! • They never ran any real tests! • Not even in controlled environments • It’s really only half the system

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