linux-kernel - Re: [PATCH] trim memory not covered by WB MTRRs

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Message-ID: <Pine.LNX.4.64.0706141625260.26236@p34.internal.lan>
Date:	Thu, 14 Jun 2007 16:26:07 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Pim Zandbergen <P.Zandbergen@...roscoop.nl>
cc:	Jesse Barnes <jesse.barnes@...el.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] trim memory not covered by WB MTRRs

On Thu, 14 Jun 2007, Pim Zandbergen wrote:

> Thanks for this patch. I was having the exact same symptoms as Justin Piszcz, 
> on a different, but similar motherboard:
>
> Motherboard: GigaByte GA-G33-DS3R
> BIOS rev: F2
> Chipset: Intel G33
> Memory: 8GB
> Distro: Fedora 7 x86_64
> Kernel: kernel-2.6.21-1.3194.fc7
>
> Building vanilla 2.6.22-rc4 with your patch solved the problem.
>
> I'm now seeing this in the syslog
>
> ***************
> **** WARNING: likely BIOS bug
> **** MTRRs don't cover all of memory, trimmed 196608 pages
> ***************
>
> leaving me 7416672 kB of usable memory.
>
> If there's any way I can help with more info or testing,
> then let me know.
>
> Thanks,
> Pim
>

That's strange, I guess different chipsets 'chew' up different amounts of 
memory OR you have your DVT(?) (video-card memory/aperature) set to 256MB? 
I have mine set to 128MB, in top:

Mem:   8039576k total,  6187304k used,  1852272k free,      696k buffers

What type of memory are you using and what is your DVT set to?

Justin.
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