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Matthieu Baerts says: ==================== tcp: fix receive autotune again Neal Cardwell found that recent kernels were having RWIN limited issues, even when net.ipv4.tcp_rmem[2] was set to a very big value like 512MB. He suspected that tcp_stream default buffer size (64KB) was triggering heuristic added inea33537d82("tcp: add receive queue awareness in tcp_rcv_space_adjust()"). After more testing, it turns out the bug was added earlier with commit65c5287892("tcp: fix sk_rcvbuf overshoot"). I forgot once again that DRS has one RTT latency. MPTCP also got the same issue. This series : - Prevents calling tcp_rcvbuf_grow() on some MPTCP subflows. - adds rcv_ssthresh, window_clamp and rcv_wnd to trace_tcp_rcvbuf_grow(). - Refactors code in a patch with no functional changes. - Fixes the issue in the final patch. ==================== Link: https://patch.msgid.link/20251028-net-tcp-recv-autotune-v3-0-74b43ba4c84c@kernel.org 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 reStructuredText 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.