I've just clean-installed 12.10 64bit and i noticed an increase in memory usage. I used 12.04 32bit and was running about ~400mb on startup(gnome3 no effects) + firefox, now the machine uses about ...
My ubuntu 64-bit 11.10 installed box has 6GB RAM but Ubuntu only uses 4.1GB. I have read various things about the 4GB limit etc, but all those talk about using less than 4GB. What could be causing ...