mptcp: use copy_from_iter helpers on transmit

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The perf traces show an high cost for the MPTCP transmit path memcpy.

It turn out that the helper currently in use carries quite a bit
of unneeded overhead, e.g. to map/unmap the memory pages.

Moving to the 'copy_from_iter' variant removes such overhead and
additionally gains the no-cache support.

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-v1-6-9dc60939d371@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Paolo Abeni 2023-10-23 13:44:39 -07:00 • committed by Jakub Kicinski

parent 5684ab1a0e

commit 0ffe8e7490

1 changed files with 15 additions and 4 deletions

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net/mptcp/protocol.c

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