Kanwar Ranbir Sandhu wrote:
Hi Everyone,
My server is only seeing 4.8 GB out of 6 GB available. I don't know why.
I have a CentOS 4.4 x86_64 server running on a Tyan s2895 with 6 GB of RAM (two 1 GB sticks and 2 2 GB sticks). I upgraded the RAM, powered up the server, and when CentOS was finished booting, checked the available RAM with free. This is what it's reporting:
total used free sharedbuffers cached Mem: 4809064 4769492 39572 0 197156 3127704 -/+ buffers/cache: 1444632 3364432 Swap: 2064376 176 2064200
The BIOS sees all of the RAM. In fact, it looks to me like the kernel knows 6 GB is available. But, it is only using 4.8 GB because I see this in dmesg:
Memory: 4808464k/6291456k available (2106k kernel code, 0k reserved, 1299k data, 196k init)
What happened to the other 1 GB+ of RAM?
It's probably a memory hole mapping setting ... you probably need to enable it - have a look under 'Advanced Hammer Configuration' (or similar) in the BIOS
James Pearson