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Lorenzo Bianconi says: ==================== XDP bulk APIs introduce a defer/flush mechanism to return pages belonging to the same xdp_mem_allocator object (identified via the mem.id field) in bulk to optimize I-cache and D-cache since xdp_return_frame is usually run inside the driver NAPI tx completion loop. Convert mvneta, mvpp2 and mlx5 drivers to xdp_return_frame_bulk APIs. More details on benchmarks run on mlx5 can be found here: https://github.com/xdp-project/xdp-project/blob/master/areas/mem/xdp_bulk_return01.org Changes since v5: - do not keep looping over ptr_ring if the cache is full but release leftover pages running page_pool_return_page Changes since v4: - fix comments - introduce xdp_frame_bulk_init utility routine - compiler annotations for I-cache code layout - move rcu_read_lock outside fast-path - mlx5 xdp bulking code optimization Changes since v3: - align DEV_MAP_BULK_SIZE to XDP_BULK_QUEUE_SIZE - refactor page_pool_put_page_bulk to avoid code duplication Changes since v2: - move mvneta changes in a dedicated patch Changes since v1: - improve comments - rework xdp_return_frame_bulk routine logic - move count and xa fields at the beginning of xdp_frame_bulk struct - invert logic in page_pool_put_page_bulk for loop ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jesper Dangaard Brouer <brouer@redhat.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.