linux-kernel - Re: Out of mtrrs

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Message-Id: <8EF35F63-8FF6-483F-9DED-D573C40430C8@ono.com>
Date:	Fri, 29 Aug 2008 18:17:18 +0200
From:	""J.A. Magallón"" <jamagallon@....com>
To:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Out of mtrrs


On 2008.08.29, at 18:01, Arjan van de Ven wrote:

> On Fri, 29 Aug 2008 17:32:49 +0200
> ""J.A. Magallón"" <jamagallon@....com> wrote:
>
>> Hi all...
>>
>> I'm using the xorg intel driver, and drm/X report it has no free  
>> mtrrs
>> in kernel to set up:
>>
>> one:~# cat /proc/mtrr
>> reg00: base=0xfffe0000 (4095MB), size= 128KB: write-protect, count=1
>> reg01: base=0xfffc0000 (4095MB), size= 128KB: uncachable, count=1
>> reg02: base=0x00000000 (   0MB), size= 256MB: write-back, count=1
>> reg03: base=0x10000000 ( 256MB), size= 256MB: write-back, count=1
>> reg04: base=0x1f800000 ( 504MB), size=   8MB: uncachable, count=1
>> reg05: base=0x1f600000 ( 502MB), size=   2MB: uncachable, count=1
>> reg06: base=0x1f500000 ( 501MB), size=   1MB: uncachable, count=1
>> reg07: base=0x00000000 (   0MB), size= 128KB: uncachable, count=1
>>

with disable_mtrr_trim, I get te same:

reg00: base=0xfffe0000 (4095MB), size= 128KB: write-protect, count=1
reg01: base=0xfffc0000 (4095MB), size= 128KB: uncachable, count=1
reg02: base=0x00000000 (   0MB), size= 256MB: write-back, count=1
reg03: base=0x10000000 ( 256MB), size= 256MB: write-back, count=1
reg04: base=0x1f800000 ( 504MB), size=   8MB: uncachable, count=1
reg05: base=0x1f600000 ( 502MB), size=   2MB: uncachable, count=1
reg06: base=0x1f500000 ( 501MB), size=   1MB: uncachable, count=1
reg07: base=0x00000000 (   0MB), size= 128KB: uncachable, count=1

Is there any other option ?

cicely:/usr/share/doc/kernel-doc# grep mtrr kernel-par*
	disable_mtrr_trim [X86, Intel and AMD only]

> did this work with older kernels?
> if so, you should disable the MTRR munging feature of newer kernels;
> it's not working well enough ;)

--
J.A. Magallon <jamagallon()ono!com>     \               Software is  
like sex:
                                          \         It's better when  
it's free
Mandriva Linux release 2009.0 (Cooker) for i586
Linux 2.6.25-jam13 (gcc 4.3.1 20080515 (GCC) #1 SMP



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