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

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Date:	Mon, 28 Apr 2008 16:15:18 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Yinghai Lu <yhlu.kernel@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Mika Fischer <mika.fischer@...pnet.de>, balajirrao@...il.com,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

Ingo Molnar wrote:
> * Gabriel C <nix.or.die@...glemail.com> wrote:
> 
>>> please try v2 version
>>>
>>> http://lkml.org/lkml/2008/4/28/115
>> Box still won't boot with mtrr_chunk_size=1g but without it is perfect 
>> :)) Thx for your work. I've quick tested some games and 3d things , 
>> all are working with this patch really nice.
> 
> 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?

The box is really new so far I tested 2.6.24* 2.6.25 , linux-next , current git from
which no one worked. And yes is right graphics under Linux didn't worked right without 
patch from http://lkml.org/lkml/2008/4/28/115.

> 
> so fixing up the MTRRs during bootup, no matter how dangerous in theory, 
> is pretty much the best option to get your system to work fine under 
> Linux, with that specific Xorg version?

Yes.

I run :

xorg-server 1.4.0.90-5 ( it has all fixes from server-1.4-branch )
mesa 7.0.2-2
xf86-video-intel 2.3.0-1

Probably I have to replace 2x2G with 2x1G to get it work without this patch but it is something I don't really want to do =)

Also I'm not sure whatever this is an BIOS bug ? I could contact ASUS people if someone tells me what is wrong with the BIOS.

> 
> i think we should still try to make this a non-default option because 
> modern Xorg should not have any need to touch MTRRs. Perhaps a .config 
> dependent on CONFIG_DANGEROUS ;-)

Hmm 1.4.0.90 is not that old , is it ?

> 
> 	Ingo
> 

Gabriel
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