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    SubjectRe: O_DIRECT sockets? (was [RESEND] tuning linux for high network performance?)
    Date
    > Hmm, I'm still not clear on why you cannot use sendfile()?
    > I was not aware of any upper limit to the file size in order
    > for sendfile() to be used? From what little I know, this
    > is exactly the kind of situation that sendfile was intended
    > to benefit.

    I can't use sendfile(). I'm working with files > 4GB, and from man 2 sendfile:

    ssize_t sendfile(int out_fd, int in_fd, off_t *offset, size_t count);

    int main() {
    ssize_t s1;
    off_t offset;
    size_t count;

    printf("sizeof ssize_t: %d\n", sizeof s1);
    printf("sizeof size_t: %d\n", sizeof count);
    printf("sizeof off_t: %d\n", sizeof offset);
    return 0;
    }

    running it

    $ ./sendfile_test
    sizeof ssize_t: 4
    sizeof size_t: 4
    sizeof off_t: 4
    $

    as far as I'm concerned, this will not allow me to address files past the 4GB
    limit (or was it 2?)

    roy

    --
    Roy Sigurd Karlsbakk, Datavaktmester
    ProntoTV AS - http://www.pronto.tv/
    Tel: +47 9801 3356

    Computers are like air conditioners.
    They stop working when you open Windows.

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