Messages in this thread | | | Date | Sun, 01 Mar 2009 20:46:03 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [patch] x86, mm: pass in 'total' to __copy_from_user_*nocache() |
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Nick Piggin wrote: > > I would expect any high performance CPU these days to combine entries > in the store queue, even for normal store instructions (especially for > linear memcpy patterns). Isn't this likely to be the case? >
Actually, that is often not the case simply because it doesn't buy that much. The big win comes when you don't read a whole cache line in from memory, but that is a property of the cache, not the store queue.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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