From: "Ralph Blach" <ralph.blach@gmail•com>
To: "moris dong" <moris_dong@hotmail•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: Large Page Support, 2.6 kernel , PPC440
Date: Mon, 8 May 2006 08:36:43 -0400 [thread overview]
Message-ID: <b06339d40605080536u2b68eedya42531ad9761dc30@mail.gmail.com> (raw)
In-Reply-To: <BAY19-F90D433E50C500C4EF93CBF8B10@phx.gbl>
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Morris,
A long time ago, I did this for a 405 and it involves much more than just
changing the page shift.
>From my memory, I will give you what I think you have to do.
1)you must go into tlb handling code and change it. That is in the
header file 44x.S i beleive.
2)You have to change the pte directory sizes
3)You have to chage the linker script.
4)You have to change the size of the zero page.
5)you have to chage dcache flush routines, to cover the new page size.
You have to find where 4096/4095 is hard coded as the page size and change
it.
This is no small job, and what you come up with will be very unsupported.
I beleive If you pin the kerel TLB you might get
the performance you need and this should be in the kernel config scripts.
Good luck,
Chip
On 5/1/06, moris dong <moris_dong@hotmail•com> wrote:
>
> Friends,
> My PPC440 (32bit) MMU supports multiple page sizes.
> For the default 4K pages, my 2.6.11 kernel compiles and boots just fine.
> I want to re-build it with large pages, to improve my application
> performance.
> I tried modifying PAGE_SHIFT in "page.h" to 13 (8K pages) and re-build my
> kernel.
> Compilation worked out fine, but my kernel does NOT boot, nor it prints
> anything to the console.
>
> Has anyone successfully compiled & booted a 2.6 kernel with pages larger
> than 4K ?
> What am I doing wrong ?
>
> Thanks a lot.
>
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next prev parent reply other threads:[~2006-05-08 12:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-01 17:35 Large Page Support, 2.6 kernel , PPC440 moris dong
2006-05-08 12:36 ` Ralph Blach [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-05-01 17:34 moris dong
2006-04-30 8:17 moris dong
2006-04-30 8:15 moris dong
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