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I have an issue with Fedora 15's available memory. The laptop it is installed on has 4GB of SDRAM, but Fedora only sees 2GB.

[njozwiak@calvin xpmc6720]$ free -m
             total       used       free     shared    buffers     cached
Mem:          2193       1994        198          0         59       1405
-/+ buffers/cache:        529       1663
Swap:         4255          0       4255

I realize F15 is a 32-bit OS, but I should still be able to access more than 2193MB. Any ideas?

[njozwiak@calvin xpmc6720]$ uname -a
Linux calvin 2.6.38.6-27.fc15.i686 #1 SMP Sun May 15 17:57:13 UTC 2011 i686 i686 i386 GNU/Linux
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What kernel are you using? The kernel needs to have BIGMEM support.

Fedora 15 offers BIGMEM support in PAE kernels. So install (for example) the Fedora 15 2.6.38 PAE kernel.

  • [njozwiak@calvin xpmc6720]$ uname -a Linux calvin 2.6.38.6-27.fc15.i686 #1 SMP Sun May 15 17:57:13 UTC 2011 i686 i686 i386 GNU/Linux. How do I determine if my kernel supports bigmem? – linsek May 30 '11 at 17:04
  • @njozwiak: check your kernel config for options containing the string CONFIG_HIGHMEM. Some of these options need to be set to yes. Paste if you are not sure. Googling suggests that Fedora has bigmem support in PAE kernels. Search for a linux kernel with PAE in the string. – Faheem Mitha May 30 '11 at 17:37

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