TCP timer management, Round trip time RTT

Posted by AJ × 05:09

how to set TCP timeout value?

• longer than RTT

– note: RTT will vary

• too short: premature timeout

– unnecessary retransmissions

• too long: slow reaction to segment loss

• The algorithm is based on continuous measurements of network performance

• Jacobson algorithm is one used for calculating RTT

• For each connection a value RTT is maintained

• RTT updated using the formula

• RTT=αRTT+(1- α)M

• Where M is time taken for ACK

• And α is the smoothing factor

• And α=7/8

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