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    SubjectRe: O_NONBLOCK is NOOP on block devices
    M vd S <> writes:
    > I also briefly tried aio_* and the libaio interface. The former is not
    > really asynchronous - all requests are put in one separate thread
    > where they will be executed in order, i.e. blocking, so you don't get
    > any advantage from NCQ or data that was cached by the disk or the
    > kernel. The latter apparently ends in an io_submit() which will block
    > until all queued reads are finished, but I might have missed something
    > there.

    What you missed is that the native aio system calls require O_DIRECT.


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