From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: problems with 1gb ddr memory sticks on linux
Date: 8 Aug 2002 11:09:30 -0700 [thread overview]
Message-ID: <aiuc4q$46j$1@cesium.transmeta.com> (raw)
In-Reply-To: <20020808163952.GJ16225@weccusa.org>
Followup to: <20020808163952.GJ16225@weccusa.org>
By author: "Bryan K. Walton" <thisisnotmyid@tds.net>
In newsgroup: linux.dev.kernel
>
> On Thu, Aug 08, 2002 at 06:47:20PM +0100, Alan Cox wrote:
> >
> > Almost certainly a BIOS problem. What typically happens when you see
> > this is that the BIOS misconfigured the MTRR registers. Linux starts
> > from top of ram windows seems to start from bottom so the effect shows
> > strongly in Linux.
> >
> > Can you post your /proc/mtrr file please
> >
> Here you go . . .
>
> Dimm slot 1 = 256MB DDR PC2100 and
> Dimm slot 2 = 1024MB DDR PC2100
>
> and the /proc/mtrr shows:
>
> casa:~# cat /proc/mtrr
> reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
>
Your BIOS didn't mark the second memory chunk as cacheable, so you're
running it uncached. No wonder it sucks.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
next prev parent reply other threads:[~2002-08-08 18:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 16:04 Bryan K. Walton
2002-08-08 16:19 ` Kasper Dupont
2002-08-08 16:52 ` Richard B. Johnson
2002-08-08 17:47 ` Alan Cox
2002-08-08 16:39 ` Bryan K. Walton
2002-08-08 18:09 ` H. Peter Anvin [this message]
2002-08-08 19:46 ` Alan Cox
2002-08-08 19:56 ` Bryan K. Walton
2002-08-08 17:50 ` Mike Dresser
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