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Date: Tue, 2 Apr 2002 23:40:53 +0100 (BST)
From: =?iso-8859-1?q?Chris=20Rankin?= <rankincj@yahoo.com>
Subject: Re: Screen corruption in 2.4.18
To: root@chaos.analogic.com
Cc: VANDROVE@vc.cvut.cz, linux-kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <Pine.LNX.3.95.1020402172447.7371A-100000@chaos.analogic.com>
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 --- "Richard B. Johnson" <root@chaos.analogic.com>
wrote: > On Tue, 2 Apr 2002, Chris Rankin wrote:
> [SNIPPED...]
> 
> > 
> > A few other things:
> > - since I have about 1.25 GB of RAM, I have
> enabled a 256 MB AGP aperture.
> 
> What? 'since amount of RAM' has nothing to do with
> AGP aperature. The
> aperature should be the same as the amount of AGP
> shared RAM used for
> the screen-card on-board graphics. This is normally
> set by the BIOS but
> can be reset if the BIOS doesn't 'understand' your
> screen card.
> 
> So, unless you have 256 MB on your screen board,
> typically 32 MB for
> high-resolution true-color boards, you will be
> disabling PCI hardware
> hand-shaking for a lot of addresses above your
> screen board. This
> can make DRAM-controler, controlled RAM accesses
> interfere.

I set the AGP aperture based upon the following
information:

"The AGP aperture is an area of system RAM reserved
for use by the AGP card for storing textures if it
needs to.  The RAM is available for use by the system
as normal if not used by the graphics card."
...
"It is generally advised to set the AGP aperture to
half the system RAM ."

Therefore, it seemed reasonable to maximise my AGP
aperture size for all and any conceivable textures (I
have system RAM to spare), with no harm done.
Admittedly, 256 MB does seem excessive, but anyway ...
;-).

Chris


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