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> 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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