Re: [PATCH] Only show RESOURCES_64BIT on relevant architectures

[Kumar Gala]

On Oct 30, 2007, at 3:37 AM, 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?

I have not.  On some PPC32 systems having proper 36-bit physical  
support usually means growing our pte to be 64-bits which creates  
additional overhead in SW TLB mgmt on these processors.

- k
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