linux-kernel - Re: [PATCH] Only show RESOURCES_64BIT on relevant architectures

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Message-Id: <C812C5E5-9AA9-42D1-AEE1-679641D1AEB9@kernel.crashing.org>
Date:	Tue, 30 Oct 2007 09:19:31 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Kyle McMartin <kyle@...artin.ca>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Only show RESOURCES_64BIT on relevant architectures


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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