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Xen Virtualization by Prabhakar Chaganti

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Physical Address Extension

Physical Address Extension (PAE) is a technology that increases the amount of physical or virtual memory available to user mode applications and thus allows servers to access physical memory beyond 4 GB. In order to achieve this, PAE modifies the 32-bit addressing mode to a 64-bit addressing mode, and thus allows the operating system and user applications to access the additional physical memory. This can significantly enhance the performance of the operating system, which is valuable especially when the server is hosting multiple operating systems. Both the Linux kernel and the Xen hypervisor can benefit from of PAE if it is present. The three modes that are available for running Xen are as follows:

  • Pure 32-bit mode. ...

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