On Wed, 25 Dec 2013 16:00:41 -0800, Sri Ram Vemulpali said: > Second, when I typed command in bash "free -m" it shows 756MB memory > available. I used "mem=" commandline option to tell kernel to use 4GB > memory. But after booting the kernel it still shows 756MB. Why is this?
If it's showing 756M because you have 768M of physical ram (3 x 256M), using mem=4G won't do what you think. That parameter is to *reduce* the amount of memory the kernel will use - it's usually useful on a machine that has (say) 16G, but you want to restrict the kernel to 10G and leave the other 6G for custom hardware or something.
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