Compiling kernel with PAE support indeed gives the 32-bit kernel ability
to use 64 gigabytes of memory. However, single processes can still use
only max 3 gigabytes. There will be 3-6% performance hit for memory
operations. The worst part is that non-PAE supporting hardware will fail
booting with the kernel. That is a blocker for making PAE kernels
default.
In any case, if you need more, switch to 64-bit platform. You can still
run 32-bit applications there if you must by using compatibility
libraries. They do work.
** Changed in: ubuntu
Status: New => Invalid
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Generic 32 bit kernel should be compiled with 64 GB memory support
https://bugs.launchpad.net/bugs/116842
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