A picture is worth a thousand words: http://img266.imageshack.us/img266/669/memoryo.png
As you can see from the screenshots I have 4 GB of ram. My current opened processes use approximately 500 MB of that.
Inexplicably, though, the memory in use is 1303 GB. What's using 700 MB?!?!
Additionally, why is my "Modified" memory always so high? Note that in that particular screenshot it's actually low, it fluctuates between 400 and 800 MB. I've never seen it lower than 400 MB. Do note that modified memory is not
available to other programs (unlike the standby memory, which will be overwritten if necessary).
This leaves me with only 2 GB of ram free for my games, which routinely run oom. 1 GB is magically unavailable. What's using it ?!