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The original driver first unregisters then re-registers all multicast addresses in the struct net_device_ops::ndo_set_rx_mode() callback. As the networking stack calls ndo_set_rx_mode() if a single multicast address change occurs, a significant amount of time may be used to first unregister and then re-register unchanged multicast addresses. This leads to performance issues when tracking large numbers of multicast addresses. Replace the unregister and register loop and the hand crafted mc_addr_list list handling with __dev_mc_sync(), to only update entries which have changed. On profiling with an fsl_dpa NIC, this patch presented a speedup of around 40 when successively setting up 2000 multicast groups using setsockopt(), without drawbacks on smaller numbers of multicast groups. Signed-off-by: Jonas Rebmann <jre@pengutronix.de> Reviewed-by: Sean Anderson <sean.anderson@seco.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.