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I have a Sony Vaio VPCZ122GX with 4GB RAM,Nvidia Cards. I install ubuntu 11.10 64 bit. I am currently open : 1 Tab Firefox, Virtual Box with 1 WinXP ~700 RAM, 1 terminal top. That's all. But Memory used is 3.5 GB. I think there must be memory leak while I can see in top: Virtualbox ( 2 process: 696MB + 37MB), Firefox 33MB. Can you help me to fix it. I try googling an searching in askubuntu but no luck.

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Can you post the output of free -m or a screenshot of top or how you are looking at your memory. –  bodhi.zazen Jan 12 '12 at 4:20
    
Here is the screenshot of Top: img716.imageshack.us/img716/6194/topuy.png –  Summer Nguyen Jan 12 '12 at 4:56
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Could it be RAM caching? linuxatemyram.com –  Dalton Miller Jan 12 '12 at 5:07
    
Yeah, may be that is right. I can see -/+ buffers/cache: 1442 2192 . It means 2192 GB RAM is currently Free. Thank you very much indeed. –  Summer Nguyen Jan 12 '12 at 5:38
    
@DaltonMiller you should post that as an answer, and let Summer Nguyen accept it. This helps both of your reputations, and makes answers easier to find for new users. –  Tom Brossman Jan 12 '12 at 8:55
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1 Answer

up vote 7 down vote accepted

This is caused by Linux caching your RAM.

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Please include some details from the link in your post as if the link were to stop working, your answer may not help future users. –  hexafraction Sep 17 '12 at 22:39
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