mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-06-16 00:57:02 -04:00
910a71ed77
Eyal Birger says: ==================== When having many xfrm interfaces, the linear lookup of devices based on if_id becomes costly. The first patch refactors xfrmi_decode_session() to use the xi used in the netdevice priv context instead of looking it up in the list based on ifindex. This is needed in order to use if_id as the only key used for xi lookup. The second patch extends the existing infrastructure - which already stores the xfrmi contexts in an array of lists - to use a hash of the if_id. Example benchmarks: - running on a KVM based VM - xfrm tunnel mode between two namespaces - xfrm interface in one namespace (10.0.0.2) Before this change set: Single xfrm interface in namespace: $ netperf -H 10.0.0.2 -l8 -I95,10 -t TCP_STREAM MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.2 () port 0 AF_INET : +/-5.000% @ 95% conf. : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 8.00 298.36 After adding 400 xfrmi interfaces in the same namespace: $ netperf -H 10.0.0.2 -l8 -I95,10 -t TCP_STREAM MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.2 () port 0 AF_INET : +/-5.000% @ 95% conf. : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 8.00 221.77 After this patchset there was no observed change after adding the xfrmi interfaces. ==================== Signed-off-by: Steffen Klassert <steffen.klassert@secunet.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.