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Eric Dumazet says: ==================== netns: speedup netns dismantles netns are dismantled by a single thread, from cleanup_net() On hosts with many TCP sockets, and/or many cpus, this thread is spending too many cpu cycles, and can not keep up with some workloads. - Removing 3*num_possible_cpus() sockets per netns, for icmp and tcp protocols. - Iterating over all TCP sockets to remove stale timewait sockets. This patch series removes ~50% of cleanup_net() cpu costs on hosts with 256 cpus. It also reduces per netns memory footprint. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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.