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

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Date:	Mon, 28 Apr 2008 22:45:31 +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

Gabriel C wrote:
> 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.

Here the output with v3 which is disabled by default:

--($:~)-- cat /proc/mtrr
reg00: base=0xd0000000 (3328MB), size= 256MB: uncachable, count=1
reg01: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1
reg02: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
reg04: base=0x120000000 (4608MB), size= 128MB: write-back, count=1
reg05: base=0x128000000 (4736MB), size=  64MB: write-back, count=1
reg06: base=0xcf600000 (3318MB), size=   2MB: uncachable, count=1

dmesg is saying now :

[   22.764595] mtrr: type mismatch for d0000000,10000000 old: write-back new: write-combining


My card settings in BIOS ( that was default ) are the following :

DVMT Mode -> DVMT Mode ( possible setting DVMT Mode or Fixed Mode )
DVMT / Memory -> 256MB ( possible settings 128/256 MB or Maximum DVMT )

Initiate Graphics Adapter -> PEG/PCI ( possible settings IGD , PCI/IGD , PCI/PEG , PEG/IGD )
Internal Graphics Mode Select -> Enabled,8MB ( possible settings Enabled,8MB , Enabled,1MB maybe Disabled I forgot to look)
PEG Port -> Auto ( possible settings Auto , Disabled )
PEG Port Force x1 -> Disabled ( possible settings Enabled , Disabled )

Of course these settings are only possible when the card is not disabled :)

I'm gonna try v4 now and enable it. Please let me know if you need more infos.

Gabriel
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