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

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Date:	Mon, 28 Apr 2008 21:38:31 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Mika Fischer <mika.fischer@...pnet.de>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>, balajirrao@...il.com,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

Yinghai Lu wrote:
> On Mon, Apr 28, 2008 at 7:24 AM, Gabriel C <nix.or.die@...glemail.com> wrote:
>> Mika Fischer wrote:
>>  > Hi Ingo,
>>  >
>>  > I'm having the same problem.
>>  >
>>  > Ingo Molnar schrieb:
>>  >> excellent. So just to make sure: this box never had proper graphics
>>  >> under Linux (under no previous kernel), due to the way the BIOS has set
>>  >> up the MTRR's, right?
>>  >
>>  > Well, not quite. X still works fine, but since the video memory is
>>  > overlapped by two of the existing MTRRs, X cannot add a write-combining
>>  > range for the video memory. That makes X rather slow especially if you
>>  > use DRI for Compiz etc.
>>
>>  Well you are lucky then :)
>>
>>  Yeah X 'worked' but it worked as slow as with vesa video driver here.
> 
> [    0.000000] rangeX: 0000000000000000 - 00000000d0000000
> [    0.000000] Setting variable MTRR 0, base: 0MB, range: 2048MB, type WB
> [    0.000000] Setting variable MTRR 1, base: 2048MB, range: 1024MB, type WB
> [    0.000000] Setting variable MTRR 2, base: 3072MB, range: 256MB, type WB
> [    0.000000] range0: 00000000cf800000 - 00000000cf800000
> [    0.000000] range: 00000000cf800000 - 00000000d0000000
> [    0.000000] Setting variable MTRR 3, base: 3320MB, range: 8MB, type WB
> [    0.000000] range0: 0000000100000000 - 0000000120000000
> [    0.000000] Setting variable MTRR 4, base: 4096MB, range: 512MB, type WB
> [    0.000000] range: 0000000120000000 - 0000000130000000
> [    0.000000] Setting variable MTRR 5, base: 4608MB, range: 256MB, type WB
> [    0.000000] hole: 000000012c000000 - 0000000130000000
> [    0.000000] Setting variable MTRR 6, base: 4800MB, range: 64MB, type UC
> 
> so your X server need two entries for WB?
> 
> can you send out /proc/mtrr with booting with disable_mtrr_cleanup?

I can just not right now , cannot reboot the box yet. In about 1h or so , maybe less.


> 
> YH
> 

Gabriel
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