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Suppose TCP uses AIMD for its congestion control without slow start. Assuming cwnd increases by 2 MSS every time a batch of ACKs is received and assuming approximately constant  round-trip times, how long in round trip time does it take for cwnd to increase from 4 MSS to 12 MSS (assuming no loss events)?
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The current cwind is 4 MSS

We are increasing it by 2 MSS every time

 

First transmission: 4 MSS 

Second transmission: 6 MSS 

Third transmission: 8 MSS

Fourth transmission: 10 MSS

Fifth transmission: 12 MSS

 

It takes 4 RTTs to increase the cwind from 4 MSS to 12 MSS.

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