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Date:	Wed, 31 Jan 2007 22:49:43 -0800
From:	"H. Peter Anvin" <>
To:	Sebastian Kemper <>
Subject: Re: 2.6.20-rc7 mtrr handling

Sebastian Kemper wrote:
> On Thursday 01 February 2007 07:13, you wrote:
>> Sebastian Kemper wrote:
>>> But now /proc/mtrr shows 256MB of video ram, same as lspci, whereas
>>> the real amount of video ram (as properly detected by X) is only
>>> 128MB.
>> The size of the aperture doesn't have to match the actual amount of
>> memory.  For many cards it doesn't.
>> 	-hpa
> Hello Peter,
> sorry, I don't understand. Are you talking about the AGP Aperture size 
> that I can set in my BIOS or about the actual video ram on the graphics 
> card. Because that's the one that the mtrr sets to its double size.

Neither.  I'm talking about the window in the address space, as shown in 

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