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    SubjectRe: Is sendfile all that sexy?
    Ingo Molnar writes:
    > On Mon, 15 Jan 2001, Jonathan Thackray wrote:

    >> It's a very useful system call and makes file serving much more
    >> scalable, and I'm glad that most Un*xes now have support for it
    >> (Linux, FreeBSD, HP-UX, AIX, Tru64). The next cool feature to add to
    >> Linux is sendpath(), which does the open() before the sendfile() all
    >> combined into one system call.

    Ingo Molnar's data in a nice table:

    open/close 7.5756 microseconds
    stat 5.4864 microseconds
    write 0.9614 microseconds
    read 1.1420 microseconds
    syscall 0.6349 microseconds

    Rather than combining open() with sendfile(), it could be combined
    with stat(). Since the syscall would be new anyway, it could skip
    the normal requirement about returning the next free file descriptor
    in favor of returning whatever can be most quickly found.

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