RTO calculation (1)
- TCP monitors the performance of each connection and computes appropriate RTO.
- Adapt to various communication media (from analog modem to high-speed LAN..)
- Adapt to network condition. (congestion..)
- Old algorithm for RTO
- TCP uses "weighted Average" of measured RTTs as estimated RTT.
- SRTT = ƒ¿X SRTT + (1 - ƒ¿) * measured RTT
- 0 < ƒ¿< 1 (usually set to 0.8 or 0.9)
- TCP computes timeout from SRTT
- RTO = ƒÀ X SRTT
- ƒÀ > 1 (usually set to 2)
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