On Mon, 10 Nov 2008, 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: Eric B Munson <[EMAIL PROTECTED]>
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