On Tue, Jun 14, 2005 at 04:17:14PM -0700, Christoph Lameter wrote:
> On Wed, 15 Jun 2005, Andi Kleen wrote:
>
> > > Hmm. No. The bigger cpu maps may benefit from cacheline alignment for
> > > even for read access.
> >
> > Why? Can you please explain that. It doesn't make sense to me.
>
> Its more likely to get a big piece of the array in a single
> cacheline if the array starts at the beginning of a cacheline.
>
> If these maps would start in the middle of a cacheline then additional
> cacheline fetches may become necessary to scan an array etc.
But the CPUs do prefetching anyways for that. Do you have numbers
that this is actually worth it?
-Andi
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