mptcp: refactor sndbuf auto-tuning

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The MPTCP protocol account for the data enqueued on all the subflows
to the main socket send buffer, while the send buffer auto-tuning
algorithm set the main socket send buffer size as the max size among
the subflows.

That causes bad performances when at least one subflow is sndbuf
limited, e.g. due to very high latency, as the MPTCP scheduler can't
even fill such buffer.

Change the send-buffer auto-tuning algorithm to compute the main socket
send buffer size as the sum of all the subflows buffer size.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-9-9dc60939d371@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Paolo Abeni 2023-10-23 13:44:42 -07:00 • committed by Jakub Kicinski

parent 9fdc779331

commit 8005184fd1

4 changed files with 70 additions and 10 deletions

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18

net/mptcp/protocol.c

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54

net/mptcp/protocol.h

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5

net/mptcp/sockopt.c

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3

net/mptcp/subflow.c

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