From: kernel-stuff@comcast.net (Parag Warudkar)
To: Martin =?ISO-8859-1?Q?=20MOKREJ=A9?= 
	<mmokrejs@ribosome.natur.cuni.cz>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: memory management weirdness
Date: Mon, 21 Feb 2005 14:20:17 +0000
Message-Id: <022120051420.20884.4219EE21000C6C9400005194220588448400009A9B9CD3040A029D0A05@comcast.net>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1151
Lines: 22

> Hi,
>   I have received no answer to my former question
> (see http://marc.theaimsgroup.com/?l=linux-kernel&m=110827143716215&w=2).
> I've spent some more time on that problem and have more or less confirmed
> it's because of buggy bios. However, the linux kernel doesn't handle properly
> such case. I've tested 2.4.30-pre1 kernel and latest 2.6.11-rc4 kernel.
> The conclusion is, that once the machine has physically installed 4x1GB
> DDR400 DIMM's (bios detects only 3556 or less memory as some buffers
> are allocated by the Intel 875P chipset and AGP card), the linux 2.6.11*
> runs up-to 18x slower than when only 2x1GB + 2x 512MB DDR memory is installed.
> 
Can you enable profiling and then post the profile info for various cases - slow and fast? Check out Documentation/basic_profiling.txt in the kernel source for understanding how to do this. This might help narrow down the issue.

Parag


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