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Ido Schimmel says: ==================== mlxsw: Remove RTNL from route insertion path This patch set removes RTNL from the route insertion path in mlxsw in order to reduce the control plane latency: the time it takes to push routes from user space to the kernel and mlxsw. Up until now mlxsw did not have a lock to protect its shared router data structures and instead relied on RTNL. While this was simple and worked, it resulted in large control plane latencies as RTNL was heavily contended - by both the task receiving the netlink messages from user space and the mlxsw workqueue that programs the routes to the device. By removing RTNL and introducing a new router mutex, this patch set reduces the control plane latency by ~80%. A single mutex is added as inside mlxsw there is not a lot of concurrency. In addition, a more fine-grained locking scheme is much more error-prone. Patches #1-#6 are preparations. They add needed locking in NVE and multicast routing code instead of relying on RTNL Patch #7 introduces the new mutex Patches #8-#12 gradually take the lock in various entry points into the routing code Patch #13 removes RTNL in places where it is no longer required ==================== 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.