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i have ASRock X58 Supercomputer mobo, which supports 24GB , DDR3. I have 6 DIMMs (each of 4GB) installed, i can see them all recognized in BIOS menu. However when i boot Linux kernel 2.6.28 (Gentoo R5) only 12GB are recognized. I tried mem=24GB on boot, but no luck. What could it be?
Could it be the page size? Or maybe because i only have 4GB swap ?
The BIOS is telling Linux that you have approximately 12GB of ram.
I don't know what the problem is, but focus on BIOS and/or motherboard issues. The problem is not in Linux.
Edit: I didn't see your post above until after I posted.
Originally Posted by nuliknol
of course, otherwise i couldn't have more than 4GB
Actually you can use over 4GB with a 32 bit (PAE) kernel. For 24GB of ram, I'm not sure whether it would be entirely unworkable or just a very poor choice. So no one is suggesting you should use a 32 bit bit kernel. But from your first post, detecting that you are not using a 32 bit kernel is beyond my expertise level. (I expect that if I understood the "kernel direct mapping tables" lines in your first post, that would have indicated a 64 bit kernel).