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Jakub Kicinski says: ==================== page_pool: allow caching from safely localized NAPI I went back to the explicit "are we in NAPI method", mostly because I don't like having both around :( (even tho I maintain that in_softirq() && !in_hardirq() is as safe, as softirqs do not nest). Still returning the skbs to a CPU, tho, not to the NAPI instance. I reckon we could create a small refcounted struct per NAPI instance which would allow sockets and other users so hold a persisent and safe reference. But that's a bigger change, and I get 90+% recycling thru the cache with just these patches (for RR and streaming tests with 100% CPU use it's almost 100%). Some numbers for streaming test with 100% CPU use (from previous version, but really they perform the same): HW-GRO page=page before after before after recycle: cached: 0 138669686 0 150197505 cache_full: 0 223391 0 74582 ring: 138551933 9997191 149299454 0 ring_full: 0 488 3154 127590 released_refcnt: 0 0 0 0 alloc: fast: 136491361 148615710 146969587 150322859 slow: 1772 1799 144 105 slow_high_order: 0 0 0 0 empty: 1772 1799 144 105 refill: 2165245 156302 2332880 2128 waive: 0 0 0 0 v1: https://lore.kernel.org/all/20230411201800.596103-1-kuba@kernel.org/ rfcv2: https://lore.kernel.org/all/20230405232100.103392-1-kuba@kernel.org/ ==================== Link: https://lore.kernel.org/r/20230413042605.895677-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.