RHEL 5.1 utilizes nested paging on AMD Barcelona Processor to improve performance
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Red Hat® Enterprise Linux® (RHEL) 5.1 provides paravirtualized (PV) drivers for guest operating systems to improve I/O performance for I/O intensive disk or network applications. In addition, RHEL 5.1 supports a feature called “nested paging,” available on AMD Barcelona processors, that translates guest virtual memory addresses to machine physical addresses using two-level translation in the hardware. Without nested paging, the hypervisor marks all page table pages as read only.
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