Re: [patch] Prefetching file_read_actor()

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 1 Jan 2002 10:29:20 +0000 (GMT)


> My initial guess is that some of the callers of copy_to_user are
> doing something that is harmed the prefetching.
> (Maybe they are doing additional prefetch() calls)

Most callers are dealing with cached data, and unless you checked the
length in advance to make a sensible decision it will just make things ugly.
If you aren't copying 512 bytes+ its probably not worth it.

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