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Pedro Tammela says: ==================== net/sched: transition actions to pcpu stats and rcu Following the work done for act_pedit[0], transition the remaining tc actions to percpu stats and rcu, whenever possible. Percpu stats make updating the action stats very cheap, while combining it with rcu action parameters makes it possible to get rid of the per action lock in the datapath. For act_connmark and act_nat we run the following tests: - tc filter add dev ens2f0 ingress matchall action connmark - tc filter add dev ens2f0 ingress matchall action nat ingress any 10.10.10.10 Our setup consists of a 26 cores Intel CPU and a 25G NIC. We use TRex to shoot 10mpps TCP packets and take perf measurements. Both actions improved performance as expected since the datapath lock disappeared. For act_pedit we move the drop counter to percpu, when available. For act_gate we move the counters to percpu, when available. [0] https://lore.kernel.org/all/20230131145149.3776656-1-pctammela@mojatatu.com/ ==================== Link: https://lore.kernel.org/r/20230214211534.735718-1-pctammela@mojatatu.com 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 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.