Transcription of TCP Flow Control and Congestion Control
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TCP Flow Control and Congestion Control
1 Mao W07 TCP Flow Control and Congestion ControlEECS 489 Computer Morley MaoMonday Feb 5, 2007 Acknowledgement: Some slides taken from Kurose&Ross and Katz&Stoica2 Mao W07 TCP Flow Control receive side of TCP connection has a receive buffer: speed-matching service: matching the send rate to the receiving app s drain rateapp process may be slow at reading from buffersender won t overflowreceiver s buffer bytransmitting too much,too fastflow control3 Mao W07 TCP Flow Control : how it works(Suppose TCP receiver discards out-of-order segments) spare room in buffer= RcvWindow= RcvBuffer-[LastByteRcvd -LastByteRead] Rcvr advertises spare room by including value of RcvWindowin segments Sender limits unACKed data to RcvWindow- guarantees receive buffer doesn t overflow4 Mao W07 TCP Connection ManagementRecall:TCP sender, receiver establish connection before exchanging data segments initialize TCP variables:- seq.
RM (resource management) cells: sent by sender, interspersed with data cells bits in RM cell set by switches (“network-assisted”) - NI bit: no increase in rate (mild congestion) - CI bit: congestion indication RM cells returned to sender by receiver, with bits intact
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