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    SubjectRe: fadvise syscall?
    On Sun, Mar 17, 2002 at 01:41:37PM +0000, Anton Altaparmakov wrote:
    > When you want large data streaming, i.e. you start getting worried about
    > memory pressure, then you want open(2) + O_DIRECT. No caching done. Perfect
    > for large data streams and we have that already. I agree that you may want
    > some form of asynchronous read ahead with passed pages being dropped from
    > the cache but that could be just a open(2) + O_SEQUENTIAL (doesn't exist yet).

    O_DIRECT isn't the right thing for large streaming. You want
    readahead and dropbehind. O_DIRECT takes substantial penalties for its
    lack of copy/cacheing. This works fine in certain circumstances
    (applications that keep their own caching), but for something like a
    video or mp3, you'll win with working dropbehind easily.



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