1bca4e6b18
This implement XDP CPU redirection load-balancing across available CPUs, based on the hashing IP-pairs + L4-protocol. This equivalent to xdp-cpu-redirect feature in Suricata, which is inspired by the Suricata 'ippair' hashing code. An important property is that the hashing is flow symmetric, meaning that if the source and destination gets swapped then the selected CPU will remain the same. This is helps locality by placing both directions of a flows on the same CPU, in a forwarding/routing scenario. The hashing INITVAL (15485863 the 10^6th prime number) was fairly arbitrary choosen, but experiments with kernel tree pktgen scripts (pktgen_sample04_many_flows.sh +pktgen_sample05_flow_per_thread.sh) showed this improved the distribution. This patch also change the default loaded XDP program to be this load-balancer. As based on different user feedback, this seems to be the expected behavior of the sample xdp_redirect_cpu. Link: https://github.com/OISF/suricata/commit/796ec08dd7a63 Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.