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Why on Unix/Linux OS machines are showing less memory (RAM) than it is? Let say i have Ubuntu machine whose have 1024 MB ram, when i open "System Monitor" "Resources" tab it shows 1001.2 MB. How i can get all RAM from Unix/Linux machines?

link doesn't help -Why does Red Hat Linux report less free memory on the system than is actually available?

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krapstuke
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You have provided a very vague sentence but i'll do my best. You likely have an integrated graphics card. A portion of the ram will be taken for video memory. You should be able to control how much is taken in bios.

James Park-Watt
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  • i need terminal command, not BIOS. I'm testing it on virtual machines – krapstuke Nov 05 '12 at 13:36
  • @krapstuke: Why don't you give us the whole picture in the question? This kind of information is relevant, now we would like to know which virt tool you are using. In most (all?) products you can control how much video RAM the machines have available somewhere in the virtual machine settings. This will be taken from the total memory you gave the machine. – Sven Nov 05 '12 at 13:39
  • @SvenW tool doesn't matter. Video memory is separated from ram. Chill out. Do you know the way to get Total ram in terminal? – krapstuke Nov 05 '12 at 13:48
  • @krapstuke Having seen your updated question please read this explanation on wikipedia (http://en.wikipedia.org/wiki/Mebibyte) – James Park-Watt Nov 05 '12 at 13:54