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 shared > buffers 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