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
