Re: [PATCH] Only show RESOURCES_64BIT on relevant architectures

[Ralf Baechle]

On Tue, Oct 30, 2007 at 02:37:19AM -0600, Matthew Wilcox wrote:

> On Mon, Oct 29, 2007 at 10:03:16PM -0500, Kumar Gala wrote:
> > The same is true on PPC32.  Its a per platform thing.   However, I'm  
> > not sure if we could hide it from the user.  There are cases on the  
> > same HW platform that you want to run with just 32-bit phys (for  
> > performance).
> 
> Have you measured what the performance difference is?

Two identical kernel configs, one with one without CONFIG_RESOURCES_64BIT:

   text    data     bss     dec     hex filename
3334684  152208  138624 3625516  37522c vmlinux
3340352  152464  138752 3631568  3769d0 vmlinux

So that's 5668, 256 bytes data and 128 bytes of bss for a total of 6052
bytes.  Not a whole lot but I still fear some users on the most
claustrophobic systems will mind.

  Ralf
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