Re: [PATCH] Only show RESOURCES_64BIT on relevant architectures

Kumar Gala
2007-10-30T14:18:33Z

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