linux-kernel - Re: [PATCH] trim memory not covered by WB MTRRs

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Date:	Wed, 6 Jun 2007 18:07:34 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Jesse Barnes <jesse.barnes@...el.com>
cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] trim memory not covered by WB MTRRs



On Wed, 6 Jun 2007, Jesse Barnes wrote:

> On Wednesday, June 6, 2007 3:03 pm Justin Piszcz wrote:
>> Mem:   8039620k total,  7936472k used,   103148k free,      708k
>> buffers Mem:   8039608k total,   969380k used,  7070228k free,
>> 1232k buffers
>>
>> I am curious, why does the patch != the mem=8832M?
>
> I'm not sure... can you post your e820 map from boot and the contents
> of /proc/mtrr?  Maybe my patch is trimming off a few too many pages, or
> maybe 8832M isn't quite right and actually ends up leaving you with a
> few uncached pages.
>
> Jesse
>

I cannot post the E820 memory map, I have no way to capture it, I cannot 
get anything from netconsole and dmesg does not show it either.

BEFORE:
reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
reg03: base=0xcf800000 (3320MB), size=   8MB: uncachable, count=1
reg04: base=0xcf700000 (3319MB), size=   1MB: uncachable, count=1
reg05: base=0x100000000 (4096MB), size=4096MB: write-back, count=1
reg06: base=0x200000000 (8192MB), size= 512MB: write-back, count=1
reg07: base=0x220000000 (8704MB), size= 128MB: write-back, count=1

AFTER:
$ cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
reg03: base=0xcf800000 (3320MB), size=   8MB: uncachable, count=1
reg04: base=0xcf700000 (3319MB), size=   1MB: uncachable, count=1
reg05: base=0x100000000 (4096MB), size=4096MB: write-back, count=1
reg06: base=0x200000000 (8192MB), size= 512MB: write-back, count=1
reg07: base=0x220000000 (8704MB), size= 128MB: write-back, count=1

But that still works.

Justin.
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