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    SubjectRe: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains
    "Stephen C. Tweedie" wrote:
    >
    > You simply cannot do physical disk IO on
    > non-sector-aligned memory or in chunks which aren't a multiple of
    > sector size.

    Why not?

    Obviously the disk access itself must be sector aligned and the total
    length must be a multiple of the sector length, but there shouldn't be
    any restrictions on the data buffers.

    I remember that even Windoze 95 has scatter-gather support for physical
    disk IO with arbitraty buffer chunks. (If the hardware supports it,
    otherwise the io subsystem will copy the data into a contiguous
    temporary buffer)

    --
    Manfred
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