• [$] The return of RWF_UNCACHED

    From LWN.net@1337:1/100 to All on Wed Dec 4 16:00:05 2024
    [$] The return of RWF_UNCACHED

    Date:
    Wed, 04 Dec 2024 15:48:18 +0000

    Description:
    Linux offers two broad ways of performing I/O to files. Buffered I/O,
    which is the usual way of accessing a file, stores a copy of the
    transferred data in the kernel's page cache to speed future accesses.
    Direct I/O, instead, moves data directly between the storage device and a user-space buffer, avoiding the page cache. Both modes have their
    advantages and disadvantages. In 2019, Jens Axboe proposed an uncached buffered mode to get some
    of the advantages of both, but that effort stalled at the time. Now,
    uncached buffered
    I/O is back with some impressive performance results behind it.

    ======================================================================
    Link to news story:
    https://lwn.net/Articles/998783/


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