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SubjectRE: [PATCH RFC] [x86] Optimize copy-page by reducing impact from HW prefetch
Hi Ingo

> Ling, mind double checking which one is the faster/better one on SNB,
> in cold-cache and hot-cache situations, copy_page or copy_page_c?
Copy_page_c
on hot-cache copy_page_c on SNB combines data to 128bit (processor limit 128bit/cycle for write) after startup latency
so it is faster than copy_page which provides 64bit/cycle for write.

on cold-cache copy_page_c doesn't use prefetch, which uses prfetch according to copy size,
so copy_page function is better.

Thanks
Ling



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