On Wed, 15 Jun 2005, Andi Kleen wrote:
> > 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?
Its not only for scanning an array. A struct may contains a lot of
related information like for example boot_cpu_data. Aligning
increases locality and the likelyhood that no additional cachelines have
to be fetched.
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