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Maciej Fijalkowski says: ==================== Although this work started as an effort to add multi-buffer XDP support to ice driver, as usual it turned out that some other side stuff needed to be addressed, so let me give you an overview. First patch adjusts legacy-rx in a way that it will be possible to refer to skb_shared_info being at the end of the buffer when gathering up frame fragments within xdp_buff. Then, patches 2-9 prepare ice driver in a way that actual multi-buffer patches will be easier to swallow. 10 and 11 are the meat. What is worth mentioning is that this set actually *fixes* things as patch 11 removes the logic based on next_dd/rs and we previously stepped away from this for ice_xmit_zc(). Currently, AF_XDP ZC XDP_TX workload is off as there are two cleaning sides that can be triggered and two of them work on different internal logic. This set unifies that and allows us to improve the performance by 2x with a trick on the last (13) patch. 12th is a simple cleanup of no longer fields from Tx ring. I might be wrong but I have not seen anyone reporting performance impact among patches that add XDP multi-buffer support to a particular driver. Numbers below were gathered via xdp_rxq_info and xdp_redirect_map on 1500 MTU: XDP_DROP +1% XDP_PASS -1,2% XDP_TX -0,5% XDP_REDIRECT -3,3% Cherry on top, which is not directly related to mbuf support (last patch): XDP_TX ZC +126% Target the we agreed on was to not degrade performance for any action by anything that would be over 5%, so our goal was met. Basically this set keeps the performance where it was. Redirect is slower due to more frequent tail bumps. ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Alexander Lobakin <alexandr.lobakin@intel.com> |
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| 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 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.