linux-kernel - Re: [PATCH 2/2] x86: mtrr_cleanup try gran

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Date:	Thu, 2 Oct 2008 16:45:49 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"J.A. Magallón" <jamagallon@....com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86: mtrr_cleanup try gran_size to less than 1M

On Thu, Oct 2, 2008 at 4:20 PM, J.A. Magallón <jamagallon@....com> wrote:
> On Thu, 2 Oct 2008 15:39:34 -0700, "Yinghai Lu" <yinghai@...nel.org> wrote:
>
> Oops, sorry, this is without cleanup. This is a distro kernel and is built
> but not enable by deafult. As it is rc7, I will use 'enble_mtrr_cleanup' ;):
>
> cicely:~# cat /proc/mtrr
> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
> reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
> reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1
> reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1
>
> I have lost 2Gb ?

that is memhole

>
> cicely:~# free
>             total       used       free     shared    buffers     cached
> Mem:       3755568     182348    3573220          0      14024      72716
> -/+ buffers/cache:      95608    3659960
>
> I can't easily try your patch, this is a distro kernel.
> I will get the src.rpm...

just pull tip/master, and use your config from /boot/config....

>
> Ahhhhh....
>
> This is a dual opteron board. dmidecode says:
>
> Handle 0x0026, DMI type 16, 15 bytes
> Physical Memory Array
>    Location: System Board Or Motherboard
>    Use: System Memory
>    Error Correction Type: Single-bit ECC
>    Maximum Capacity: 8 GB
>    Error Information Handle: Not Provided
>    Number Of Devices: 8
>
> So it maps one Opteron memory in first 4Gb and the other on the second 4Gb.
> So I should have 2Gb@0 and 2Gb@....
> What I don't know is why the bios eats up 256Mb.

check if you enable memhole remapping in BIOS.

YH
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