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Memory Issue

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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,
Sekar

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