Congestion ControlSharingCross-layerBufferingSolutionsCongestion ControlMIT OpenCourseWarehttp://ocw.mit.edu 6.033 Computer System Engineering Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.Congestion ControlE2ENetworkLinkReliabilityTimersSliding windowFlow controlCross-layerPlan: Sender i sends @ rate ri.Too fast Î slow downToo slow Î speed upBufferingToo little? Æ DROPToo much? Æ Potential for congestion collapse- How much?3 2 1rxmit 1congestion collapseThruputCOff loadWant: C Li 5 C + 1 < 1 RTTs +\ Buffering No congestion collapse 1 1-100 RTTs -.\ + Reasonable utiliz'n + Equitable allocationSolutions- Some buffering Æ < 1 RTT- Congestion Î feedback Æ DROP- Get feedback Î adapt Æ change speedCongestion ControlSelf-pacing- ACKs strobe data- Packet dropWindow
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