Memory Issue

[Jegadeesh]

Hi,

I have 4GB memory in my machine . The machine is four Intel(R) Xeon(R)
CPU - 1.60GHz  processors box. The bios correctly shows 4GB memory.
Initially the machine had Redhat Enterprise Linux 3 on it and the
machine showed all 4GB memory . Now I have reinstalled the OS to FC6 .
But now machine shows only 3 GB memory.

We have tried recompiling the linux kernel with following options but
still it didnt show all the available memory (4GB)
Method :1

CONFIG_HIGHMEM4G=y
    CONFIG_HIGHMEM=y

Method : 2

CONFIG_HIGHMEM64G=y
   CONFIG_HIGHMEM=y

We have also tried passing boot option mem=4096M  to the kernel
without any luck.

What it could be the reason? How to fix this issue?

Thanks in advance,
-Jegadeesh

[Jan Welker]

Are you using a 64 or 32 bit version of Fedora 6?

Cheers, Jan

On 5/2/07, Jegadeesh  wrote:
> Hi,
>
> I have 4GB memory in my machine . The machine is four Intel(R) Xeon(R)
> CPU - 1.60GHz  processors box. The bios correctly shows 4GB memory.
> Initially the machine had Redhat Enterprise Linux 3 on it and the
> machine showed all 4GB memory . Now I have reinstalled the OS to FC6 .
> But now machine shows only 3 GB memory.
>
> We have tried recompiling the linux kernel with following options but
> still it didnt show all the available memory (4GB)
> Method :1
> CONFIG_HIGHMEM4G=y
> CONFIG_HIGHMEM=y
>
>
> Method : 2
>
> CONFIG_HIGHMEM64G=y
>    CONFIG_HIGHMEM=y
>
> We have also tried passing boot option mem=4096M  to the kernel
> without any luck.
>
> What it could be the reason? How to fix this issue?
>
> Thanks in advance,
> -Jegadeesh
>
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[luca porcu]

2007/5/2, Jegadeesh :
> Hi,
>
> I have 4GB memory in my machine . The machine is four Intel(R) Xeon(R)
> CPU - 1.60GHz  processors box. The bios correctly shows 4GB memory.
> Initially the machine had Redhat Enterprise Linux 3 on it and the
> machine showed all 4GB memory . Now I have reinstalled the OS to FC6 .
> But now machine shows only 3 GB memory.

For use more RAM use the PAE:

yum install kernel-PAE

kernel-PAE.i686                          2.6.20-1.2948.fc6      updates
Matched from:
kernel-PAE
This package includes a version of the Linux kernel with support for up to
64GB of high memory. It requires a CPU with Physical Address Extensions
(PAE).
The non-PAE kernel can only address up to 4GB of memory.
Install the kernel-PAE package if your machine has more than 4GB of memory.

bye

luca