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TCP Dynamic Parameter Control draft-song-dclc-tcpdc-01

TCP Dynamic Parameter Control draft-song-dclc-tcpdc-01. Haibin Song haibin.song@huawei.com Rachel Huang rachel.huang@huawei.com. Problems. End hosts will reduce TCP sending window sharply when packet loss But packet loss does not necessarily mean network congestion!!!

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TCP Dynamic Parameter Control draft-song-dclc-tcpdc-01

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  1. TCP Dynamic Parameter Controldraft-song-dclc-tcpdc-01 HaibinSong haibin.song@huawei.com Rachel Huang rachel.huang@huawei.com

  2. Problems • End hosts will reduce TCP sending window sharply when packet loss • But packet loss does not necessarily mean network congestion!!! • If there is no congestion in the network or the receiver, the sender SHOULD NOT do that • Small init_cwnd impacts user experience when the network is idle • Small init_cwnd means more cycles for a given size file transfer, Especially for web browsing • Why not using large init_cwnd when the network status is good?

  3. Motivations • Can we adjust TCP parameters according to network status, instead of using those fixed TCP parameters? • Should also consider the endpoints properties, like network locations, subscription bandwidth level, and etc

  4. Goals • To Make TCP aware of network status, as well as endpoint properties

  5. TCP Parameters Dynamic Control Network TOE Guidance Template End host End host TOA TOA End host TOA • TOE gets network status information and end host subscription information , from NMS or • SDN controller; • TOE provides guidance TCP parameters relative to different network status to TOA; • ([Sender upband,] [Recvrdownband,] relative network status) => TCP_Par_guidance • TOA adjusts its host TCP parameters according to guidance from TOE • Regularly check the network status, or be notified of the network status changes

  6. Guidance Levels • Network level • Could be a LAN, DC, AS, or etc • Consider the general status of the whole network, and then give the suggested {[Endpoint properties], network status} <-> TCP parameter mapping template for it • Link level • Consider the particular link status between sender and receiver • Usually dedicated link, or the route can be predicted • {[Endpoint properties], the particular link status} <-> TCP parameter mapping template for it

  7. Messages • Request/Response • Get the current recommendations • Subscription Mode • Can get updated guidance template when there is any change

  8. Next step • MoniaGhobadi will be the co-author • Ask for comments in the list • Further improve the document • Thank you!

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