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Eric Dumazet says: ==================== tcp: add fast path in timer handlers As mentioned in Netconf 2024: TCP retransmit and delack timers are not stopped from inet_csk_clear_xmit_timer() because we do not define INET_CSK_CLEAR_TIMERS. Enabling INET_CSK_CLEAR_TIMERS leads to lower performance, mainly because del_timer() and mod_timer() happen from different cpus quite often. What we can do instead is to add fast paths to tcp_write_timer() and tcp_delack_timer() to avoid socket spinlock acquisition. ==================== Link: https://patch.msgid.link/20241002173042.917928-1-edumazet@google.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 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.