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Testing small size RPCs (300B-400B) on a large AMD system suggests that page pool recycling is very useful even for just the head frags. With this patch (and copy break disabled) I see a 30% performance improvement (82Gbps -> 106Gbps). Convert bnxt from normal page frags to page pool frags for head buffers. On systems with small page size we can use the same pool as for TPA pages. On systems with large pages the frag allocation logic of the page pool is already used to split a large page into TPA chunks. TPA chunks are much larger than heads (8k or 64k, AFAICT vs 1kB) and we always allocate the same sized chunks. Mixing allocation of TPA and head pages would lead to sub-optimal memory use. Plus Taehee's work on zero-copy / devmem will need to differentiate between TPA and non-TPA page pool, anyway. Conditionally allocate a new page pool for heads. Link: https://patch.msgid.link/20241109035119.3391864-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| kernel | ||
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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 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.