linux-kernel - Re: 2.6.27 mtrr fixes do not work

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Date:	Thu, 21 Aug 2008 20:44:15 +0200
From:	Alexander Huemer <alexander.huemer@....ac.at>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: 2.6.27 mtrr fixes do not work

Yinghai Lu wrote:
> On Thu, Aug 21, 2008 at 7:52 AM, Alexander Huemer
> <alexander.huemer@....ac.at> wrote:
>   
>> Yinghai Lu wrote:
>>     
>>> On Thu, Aug 14, 2008 at 7:09 AM, Alexander Huemer
>>> <alexander.huemer@....ac.at> wrote:
>>>
>>>       
>>>> Yinghai Lu wrote:
>>>>
>>>>         
>>>>> On Thu, Aug 7, 2008 at 4:30 PM, Alexander Huemer
>>>>> <alexander.huemer@....ac.at> wrote:
>>>>>
>>>>>
>>>>>           
>>>>>> Yinghai Lu wrote:
>>>>>>
>>>>>>
>>>>>>             
>>>>>           
>>>>>>>> can you put "debug" in command line too?
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>> without mtrr_chunk_size etc in command line...please
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>> http://xx.vu/~ahuemer/dmesg_3.txt
>>>>>>
>>>>>>
>>>>>>
>>>>>>             
>>>>> do you have
>>>>> CONFIG_MTRR=y
>>>>> CONFIG_MTRR_SANITIZER=y
>>>>> CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
>>>>> CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
>>>>>
>>>>> in your .config?
>>>>>
>>>>> YH
>>>>>
>>>>>
>>>>>           
>>>> 2.6.27_rc3 does not solve the problem either.
>>>> what can i do to help?
>>>>
>>>>         
>>> please send out you config
>>>
>>> YH
>>>
>>>       
>> yinghai,
>>
>> i just tried out 2.6.27-rc4, unfortunately without success.
>>
>> here are my settings again,
>> if you need more info, just tell me.
>>
>> as you can see, the mtrr size values are complete nonsense.
>> the framebuffer should be at d8000000.
>> i am unsure if this is the fault of the kernel or the bios.
>> or should the MTRR_SANITIZER resolv all broken bios issues?
>>
>>   # uname -a
>>   Linux seaburg 2.6.27-rc4-blackbit #1 SMP Thu Aug 21 15:53:38 CEST
>>   2008 x86_64 Intel(R) Xeon(R) CPU E5420 @ 2.50GHz GenuineIntel GNU/Linux
>>   # grep -E "(^\(WW\)|^\(EE\)|^\(NI\)|^\(??\))" /var/log/Xorg.0.log
>>   (WW) VESA(0): Failed to set up write-combining range
>>   (0xd8000000,0x2000000)
>>   # dmesg|grep mtrr                                                 Command
>> line: root=/dev/sda1
>>   video=uvesafb:1280x1024-24@97,mtrr:3,ywrap mtrr_chunk_size=512m
>>   Kernel command line: root=/dev/sda1
>>   video=uvesafb:1280x1024-24@97,mtrr:3,ywrap mtrr_chunk_size=512m
>>     
>
> please boot without mtrr_chunk_size=512m
> and put debug in your command line
>
>
>   
>>   # cat /proc/mtrr
>>   reg00: base=0x00000000 (   0MB), size=198656MB: write-back, count=1
>>   reg01: base=0x80000000 (2048MB), size=197632MB: write-back, count=1
>>   reg02: base=0x100000000 (4096MB), size=197632MB: write-back, count=1
>>     
>
> another case of crazy size in /proc/mtrr
>
> it is E5420, maybe mtrr code has problem to handle that cpu?
>
> YH
>   
yinghai,

i booted as you suggested. i cannot see any difference.
here is the dmesg output: http://xx.vu/~ahuemer/dmesg_4.txt

what else can i do?

-- 
thanks
alex
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