I just followed this guide today:
Each command worked without error. After I reboot, nothing has changed. I am still only seeing 3GB of the 8GB on my laptop. Maybe this guide is incorrect but I need some help and I don't know where to start.
3 notes about the guide:
1. Step six is simply "make" but this will take forever.
If you have a multicore processor you should use "make -j N" where N=cores like "make -j 4" for a quad core.
2. Step seven says "update-initramfs -u"
For me this defaulted to the wrong kernel package. If you have multiple kernels in your grub you want to target the current one.
Use "update-initramfs -k $(uname -r) -u" to target the currently running kernel image.
3. The final instruction for testing your installation has an HTML typo in it:
"root@bt:~# cat /boot/config-3.2.6 | grep HIGHMEM</span"
That last bit should be "</span>" so don't include that on the command line.
The command should be just "cat /boot/config-3.2.6 | grep HIGHMEM"
To which I get:
# CONFIG_NOHIGHMEM is not set
# CONFIG_HIGHMEM64G is not set