Re: [PATCH] x86_64/__iowrite32_copy: don't use string move for PIOwrites

[H. Peter Anvin]

John Gregor wrote:
> From: John Gregor <johng@xxxxxxxxxxxxxxxxxxxxx>
> 
> Some processors can write the same word more than once if the movs
> instruction is used. This version uses normal memory move instructions
> and gets the same performance since the speed is limited by PCIe and
> write combining.
> 

Which processors do that *when addressing I/O memory*?

	-hpa
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