Re: [patch] Prefetching file_read_actor()

From: Alan Cox (
Date: Tue Jan 01 2002 - 05:29:20 EST

> 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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This archive was generated by hypermail 2b29 : Mon Jan 07 2002 - 21:00:14 EST