Messages in this thread | | | From | Kumar Gala <> | Subject | Re: [PATCH] Only show RESOURCES_64BIT on relevant architectures | Date | Tue, 30 Oct 2007 09:19:31 -0500 |
| |
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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |