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    SubjectRe: [RFD w/info-PATCH] device arguments from lookup, partion code


    On Mon, 21 May 2001, Alan Cox wrote:

    > > > I don't need to read it. Don't be insulting. Sure, you *can* use a
    > > > write(2)/read(2) cycle. But that's two syscalls compared to one with
    > > > ioctl(2) or transaction(2). That can matter to some applications.
    > >
    > > I just don't think so. Where did you see performance-critical use of
    > > ioctl()?
    >
    > AGP, video4linux,...

    Which, BTW, is a wonderful reason for having multiple channels. Instead
    of write(fd, "critical_command", 8); read(fd,....); you read from the right fd.
    Opened before you enter the hotspot. Less overhead than ioctl() would
    have...

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