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9e542ff8b7
The likely() annotation in l3mdev_master_ifindex_by_index() has been found to be incorrect 100% of the time in real-world workloads (e.g., web servers). Annotated branches shows the following in these servers: correct incorrect % Function File Line 0 169053813 100 l3mdev_master_ifindex_by_index l3mdev.h 81 This is happening because l3mdev_master_ifindex_by_index() is called from __inet_check_established(), which calls l3mdev_master_ifindex_by_index() passing the socked bounded interface. l3mdev_master_ifindex_by_index(net, sk->sk_bound_dev_if); Since most sockets are not going to be bound to a network device, the likely() is giving the wrong assumption. Remove the likely() annotation to ensure more accurate branch prediction. Signed-off-by: Breno Leitao <leitao@debian.org> Reviewed-by: David Ahern <dsahern@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20241008163205.3939629-1-leitao@debian.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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.