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In addition to tcp autotuning during read, it may also increase the receive buffer in tcp_clamp_window(). In this case, mptcp should adjust its receive buffer size as well so it can move all pending skbs from the subflow socket to the mptcp socket. At this time, TCP can have more skbs ready for processing than what the mptcp receive buffer size allows. In the mptcp case, the receive window announced is based on the free space of the mptcp parent socket instead of the individual subflows. Following the subflow allows mptcp to grow its receive buffer. This is especially noticeable for loopback traffic where two skbs are enough to fill the initial receive window. In mptcp_data_ready() we do not hold the mptcp socket lock, so modifying mptcp_sk->sk_rcvbuf is racy. Do it when moving skbs from subflow to mptcp socket, both sockets are locked in this case. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.