Messages in this thread | | | From | "Ma, Ling" <> | Date | Tue, 28 Jun 2011 23:23:52 +0800 | Subject | RE: [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
| |