Missing RTO update for timed-out stream not ESTABLISHED about mtcp HOT 4 CLOSED

Hi, the states under established will be SYN_SENT or SYN_RCVD state.
In those states, there will be no ACK received from the peer, meaning that no RTT has been calculated.
Do you mean we need to do exponential backoff for this case?

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I remember that RTT only involves in calculating RTO of streams established.

For SYN_SENT, the new RTO will be the old one multiple by 2. Which equals to (initial timeout)* 2^n
n is number of retransmission times
Most of the times, initial timeout of TCP will be 1 second so that the RTO of stream will be 2^n

from mtcp.

You can view some streams in that circumstance in wireshark, their RTO grow exponential

from mtcp.

Ok. I'll make the following update for this.

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