A quick look at top:
Mem: 3095608k total, 2405948k used, 689660k free, 292560k buffers
Swap: 722920k total, 43508k used, 679412k free, 1034276k cached
So there are 689 MB of unused memory! Not to mention 1 GB+ of of cached stuff for the system to grab in case of need.
Now let's see the memory usage (top two):
238m 126m 26m /usr/bin/systemsettings
294m 95m 23m /usr/lib/firefox-3.6.14/firefox-bin
So the two main memory users (systemsettings!?!) have committed more than half a gig of RAM, but use less than a quarter (I know these numbers are not perfect, but the idea remains).
And you want me to get rid of overcommit???
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