Re: [CentOS] x86 uniprocessor 4GB memory

Bruno Sousa wrote:

Hi there,

I'm currently using CentOS 4.3 (Server edition) in a HP DC 5100 with the IntelR 915GV chipset, powered by a PIV 3.0GHZ.

Now I'm facing a problem, with memory.

I got myself 4GB of memory, the system bios detects it correctly, but in Linux can only see around 3.5gb memory. With the default kernel-smp (I use hyperthread) or with kernel-hugemem , I have the same results.

Is there any way to workaround this issue?

It is probably the 4Gb memory hole issue - various 'things' reserve memory below 4GB so hiding the real memory from the OS.

Your BIOS may have a mapping option to map some of this hidden real memory to above 4Gb - however, you need to use a hugemem kernel to access this memory.

James Pearson