Re: [PATCH] Clarify pci_iomap() usage for MMIO-only devices

[Benjamin Herrenschmidt]

On Tue, 2007-09-18 at 13:30 -0700, Linus Torvalds wrote:
> Quite frankly, if performance is a _real_ reason to avoid 
> ioread*/iowrite*, I'll happily accept read*/write*, but it would be
> needed 
> to be backed up by real numbers. Can you even measure it?
> 

Also, I've been told that modern x86 chipsets have the ability to remap
IO space in the CPU physical address space. Is that true ? That would
allow even x86 to get rid of the condition and just use some magic
offset at map time.

Ben.


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