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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