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

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Date:	Wed, 24 Oct 2007 21:46:45 +0530
From:	"Rajkumar S" <rajkumars@...il.com>
To:	"Robert Hancock" <hancockr@...w.ca>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: HIGHMEM64G Kernel (2.6.23.1) makes system crawl

On 10/24/07, Robert Hancock <hancockr@...w.ca> wrote:
> 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.

I have upgraded the bios to latest  (v. 0293 October 02, 2007)
Previously the /proc/mtrr was:

ravanan:~# cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
reg03: base=0xcf800000 (3320MB), size=   8MB: uncachable, count=1
reg04: base=0xcf600000 (3318MB), size=   2MB: uncachable, count=1
reg05: base=0xcf500000 (3317MB), size=   1MB: uncachable, count=1
reg06: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
reg07: base=0x120000000 (4608MB), size= 128MB: write-back, count=1

Now after upgrading the bios it's

reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
reg03: base=0xcf800000 (3320MB), size=   8MB: uncachable, count=1
reg04: base=0xcf400000 (3316MB), size=   4MB: uncachable, count=1
reg05: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
reg06: base=0x120000000 (4608MB), size= 128MB: write-back, count=1

raj
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