Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S byfast string.

[Pavel Machek]

> Ling, if you are interested, could you send a user-space test-app to 
> this thread that everyone could just compile and run on various older 
> boxes, to gather a performance profile of hand-coded versus string ops 
> performance?
> 
> ( And i think we can make a judgement based on cache-hot performance
>   alone - if then the strings ops will perform comparatively better in
>   cache-cold scenarios, so the cache-hot numbers would be a conservative
>   estimate. )

Ugh, really? I'd expect cache-cold performance to be not helped at all
(memory bandwidth limit) and you'll get slow down from additional
i-cache misses...
								Pavel

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