1a3e4d6a75
Sebastian Andrzej Siewior says: ==================== net: Provide SMP threads for backlog NAPI The RPS code and "deferred skb free" both send IPI/ function call to a remote CPU in which a softirq is raised. This leads to a warning on PREEMPT_RT because raising softiqrs from function call led to undesired behaviour in the past. I had duct tape in RT for the "deferred skb free" and Wander Lairson Costa reported the RPS case. This series only provides support for SMP threads for backlog NAPI, I did not attach a patch to make it default and remove the IPI related code to avoid confusion. I can post it for reference it asked. The RedHat performance team was so kind to provide some testing here. The series (with the IPI code removed) has been tested and no regression vs without the series has been found. For testing iperf3 was used on 25G interface, provided by mlx5, ix40e or ice driver and RPS was enabled. I can provide the individual test results if needed. ==================== Link: https://lore.kernel.org/r/20240325074943.289909-1-bigeasy@linutronix.de 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.