linux-kernel - Re: HIGHMEM64G Kernel (2.6.23.1) makes system crawl

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Message-id: <471F560D.4040909@shaw.ca>
Date:	Wed, 24 Oct 2007 08:26:21 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Rajkumar S <rajkumars@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: HIGHMEM64G Kernel (2.6.23.1) makes system crawl

Rajkumar S wrote:
> Hello,
> 
> I am using a Core 2 Duo E6750 CPU on an intel DG33FB mother board with
> 4GB Ram, running Debian Lenny.
> 
> Since the box has 4 GB ram I compiled a big mem kernel, but the
> machine is very slow while running big mem kernel. It takes about 37
> minutes to compile the intel e1000 driver  (e1000-7.6.5.tar.gz) from
> intel site. But it's performing normally when using a non big mem
> kernel. The diff of the .config between working and non working is as
> follows.

Post your contents of /proc/mtrr. Likely a BIOS bug which has been seen 
on a number of Intel boards, which doesn't mark all of RAM as cachable. 
When the top memory starts being used with the bigmem kernel it causes a 
major slowdown. Check for a BIOS update from Intel, first.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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