I haven't upgraded to 6x yet and expect to quite soon.
I'm a little hesitant as I'm experiencing swap use.
Environment is virtual machine (Xen 5.5) running CentOS 5.3 (64bit)
I have allocated ~2.5GB RAM and as you can see it's both used and going into swap for another 500MB.
Mem: 2560000k total, 2504688k used, 55312k free, 92636k buffers
Swap: 1052248k total, 525804k used, 526444k free, 331284k cached
There are less than 100 users on this system and it's very lightly used at the moment. Do I really need to have 3GB+ RAM for this?