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Showing content from https://github.com/multipath-tcp/mptcp_net-next/issues/332 below:

implement a "opportunistic retransmission" · Issue #332 · multipath-tcp/mptcp_net-next · GitHub

The goal of the "opportunistic retransmission" is to quickly reinject packets when we notice the window has just been closed on one path, see the section 4.2 of: https://www.usenix.org/system/files/conference/nsdi12/nsdi12-final125.pdf

This is implemented in mptcp.org, see mptcp_rcv_buf_optimization().

With the current API in the Upstream kernel, a new scheduler doesn't have the ability to trigger a reinjection. Currently there are only hooks to initiate reinjection when the MPTCP RTO fires.

The packet scheduler should be able to get more info:

• not just when MPTCP cwnd close or the seq num has increased (max allowed MPTCP level seq num to be sent == last ack + (...))
• but also when there is a RTO at subflow level: maybe linked to scheduler: react when subflow-level events pop up (ACK/RTO) #343

Note that the packet scheduler never significantly queue more than what the cwnd of a subflow would accept: currently, the in-kernel only accepts to queue up to the MPTCP level cwnd (a few more bytes due to round-up)

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