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 ini
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 rate app process may be slow at reading from buffer sender won’t overflow receiver’s buffer by transmitting too much, too fast flow control
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