linux-kernel - Re: [PATCH] x86_32: trim memory by updating e820 v3

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Date:	Mon, 28 Apr 2008 02:09:47 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Mika Fischer" <mika.fischer@...pnet.de>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, "Andi Kleen" <ak@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Jesse Barnes" <jesse.barnes@...el.com>, balajirrao@...il.com
Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

On Mon, Apr 28, 2008 at 1:38 AM, Mika Fischer <mika.fischer@...pnet.de> wrote:
> Hi Yinghai,
>
>  Yinghai Lu schrieb:
>
> >>  reg00: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
>  >>  reg01: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
>  >>  reg02: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>  >>  reg03: base=0xbf700000 (3063MB), size= 1MB: uncachable, count=1
>  >>  reg04: base=0xbf800000 (3064MB), size= 8MB: uncachable, count=1
>  >>
>  >>  which screws up the X server's attempt to map the video memory at
>  >>  0xd0000000.
>  >
>  > please try the patch at
>  >
>  > http://lkml.org/lkml/2008/4/28/52
>  >
>  > with mtrr_chunk_size=1g, and you should get
>  >
>  > you should get
>  >>  reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
>  >>  reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
>  >>  reg02: base=0xbf700000 (3063MB), size= 1MB: uncachable, count=1
>  >>  reg03: base=0xbf800000 (3064MB), size= 8MB: uncachable, count=1
>  >>  reg04: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>
>  Wow, thanks a lot for this patch! It almost works. This is what I get
>  with mtrr_chunk_size=1g:
>
> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
>  reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
>  reg02: base=0xbf700000 (3063MB), size=   1MB: uncachable, count=1
>  reg03: base=0xbf800000 (3064MB), size=   8MB: uncachable, count=1
>  reg04: base=0x100001000 (4096MB), size=   4KB: write-back, count=1
>  reg05: base=0x100002000 (4096MB), size=   8KB: write-back, count=1
>  reg06: base=0x100004000 (4096MB), size=  16KB: write-back, count=1
>  reg07: base=0x100008000 (4096MB), size=  32KB: write-back, count=1
>
>  And this is what I get without mtrr_chunk_size=1g:
>
> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
>  reg01: base=0x80000000 (2048MB), size= 512MB: write-back, count=1
>  reg02: base=0xa0000000 (2560MB), size= 256MB: write-back, count=1
>  reg03: base=0xb0000000 (2816MB), size= 256MB: write-back, count=1
>  reg04: base=0xbf700000 (3063MB), size=   1MB: uncachable, count=1
>  reg05: base=0xbf800000 (3064MB), size=   8MB: uncachable, count=1
>  reg06: base=0x100001000 (4096MB), size=   4KB: write-back, count=1
>  reg07: base=0x100002000 (4096MB), size=   8KB: write-back, count=1
>
>  I attached these outputs and the dmesgs to the bug report:
>
> http://bugzilla.kernel.org/show_bug.cgi?id=10508
>
>  dmesg with mtrr_chunk_size=1g:
>  http://bugzilla.kernel.org/attachment.cgi?id=15945
>
>  dmesg without mtrr_chunk_size=1g:
>  http://bugzilla.kernel.org/attachment.cgi?id=15946
>

thanks for testing

please check
http://lkml.org/lkml/2008/4/28/115

also, can you try 64bit too?

YH
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