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Ido Schimmel says: ==================== mlxsw: Improve IPv6 route insertion rate Unlike IPv4, an IPv6 multipath route in the kernel is composed from multiple sibling routes, each representing a single nexthop. Therefore, an addition of a multipath route with N nexthops translates to N in-kernel notifications. This is inefficient for device drivers that need to program the route to the underlying device. Each time a new nexthop is appended, a new nexthop group needs to be constructed and the old one deleted. This patchset improves the situation by sending a single notification for a multipath route addition / deletion instead of one per-nexthop. When adding thousands of multipath routes with 16 nexthops, I measured an improvement of about x10 in the insertion rate. Patches #1-#3 add a flag that indicates that in-kernel notifications need to be suppressed and extend the IPv6 FIB notification info with information about the number of sibling routes that are being notified. Patches #4-#5 adjust the two current listeners to these notifications to ignore notifications about IPv6 multipath routes. Patches #6-#7 adds add / delete notifications for IPv6 multipath routes. Patches #8-#14 do the same for mlxsw. Patch #15 finally removes the limitations added in patches #4-#5 and stops the kernel from sending a notification for each added / deleted nexthop. Patch #16 adds test cases. v2 (David Ahern): * Remove patch adjusting netdevsim to consume resources for each fib6_info. Instead, consume one resource for the entire multipath route * Remove 'multipath_rt' usage in patch #10 * Remove 'multipath_rt' from 'struct fib6_entry_notifier_info' in patch #15. The member is only removed in this patch to prevent drivers from processing multipath routes twice during the series ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.