On Mon, Nov 10, 2008 at 11:55:33AM +0000, Mel Gorman wrote:
> In the situation a caller allocates multiple buffers with
> get_hugepage_region(), all the buffers will align to the start of the
> hugepage. This means the buffers are almost certainly using the same
> cachelines and operations like copying between the arrays will be mysteriously
> slow in comparison to buffers allocated from malloc(). In STREAM, allocating
> the three arrays using get_huge_pages() was approximately 40% the throughput
> of malloc().
>
> When requested, this patch uses bytes that would normally be wasted to
> offset the buffer by some random cacheline. Effort is made to select a
> random cache-line to give good average performance.
>
> Signed-off-by: Mel Gorman <[EMAIL PROTECTED]>
Acked-by: David Gibson <[EMAIL PROTECTED]>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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