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PAE doesn't change anything about virtual addresses. As the name hints, it's only about physical addresses. As an application programmer, PAE doesn't change anything for you. Your program still has a 32-bit address space, out of which the kernel takes approximately 1 bit (Linux grants 1GB, 2GB or 3GB to userspace depending on compilation options). If you ...


pae stand for physical address extension and allow a cpu with a 32bit address bus to address more than 4G. Notice that if your /proc/cpuinfo show support for pae isn't enough, you need to use a kernel compiled with pae options enabled (eg: I'm using a Debian prebuilt 3.16-2-686-pae) The memory model/layout of a Linux process is defined by the Linux kernel ...

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