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Undiscombobulating Un-Flows.

Undiscombobulating Un-Flows. Jon Crowcroft, University of Cambridge Currently IMDEA Networks. Jon.Crowcroft@cl.cam.ac.uk http://www.cl.cam.ac.uk/~jac22. Cdn v. swarm – matrix?. What’s a Flow?. The idea of flow is being undone We’re splitting flows over multipath

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Undiscombobulating Un-Flows.

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  1. Undiscombobulating Un-Flows. Jon Crowcroft, University of Cambridge Currently IMDEA Networks. Jon.Crowcroft@cl.cam.ac.uk http://www.cl.cam.ac.uk/~jac22 @Snagstuhl

  2. Cdn v. swarm – matrix?

  3. What’s a Flow? • The idea of flow is being undone • We’re splitting flows over multipath • We’re sourcing traffic in swarms • At a point in the net, how do you tell? • Guilt by association used to be possible • C.f. ASM – Any Source Multicast • Flow ID was group address + Dst Port • Need to recover this identity • Eg. so net (re-)feedback works • Need to work out what appropriate rate is.

  4. Data Driven Demands • Next step in evolution of CDN • Is to make the swarm a building block • Still have higher level identifiers • Meta-data, pub/sub/interest etc • But no lower level id • Does statistical mux/drop in queue + • Rate adjustment at edge • Still add up to a sensible behaviour? • And what is the rate adjustment • Given there’s more than one edge?

  5. Lets dream we had ASM still • Could assign marks to a swarm • Based on group • Each receiver could assign weight to feedback • And each source could adjust aggregate rate to group to meet fair/efficient goal • Question 1: Does this new “flow unit” still aggregate the right way? • Question 2: does it still improve over multipath • Question 3: mech. Do mechanisms to assign flows to multipath subpaths still apply to this new type of flow unit

  6. Some more small nits • How to do reliability (recall srm) • We do now have fec and netcoding as first class building blocks…so maybe ok • But in the presence of packet drop as a CC feedback signal… • …fec level to add isn’t totally obvious

  7. Questions? • Just to make matters worse, • All the flows are short lived.

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