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Rapid Virtualization Indexing is the AMD implementation of nested page tables technology which

allows virtual machines to manage memory more directly. Rapid Virtualization Indexing eliminates

the time the hypervisor spends managing shadow pages in software, and accelerates this task with

much faster hardware-based page management. This hardware-based management reduces

hypervisor overhead and improves the speed of the guest OS.

Figure 5. Hardware-based management using nested page tables reduces hypervisor overhead, compared to

software-based management of shadow page tables, thus improving the speed of the guest OS.

Average CPU Power metric

Because of rising power and cooling costs in data centers, organizations are adopting a new

paradigm that focuses on maximizing system energy efficiency down to the component level. This is

especially true for the processor, which represents a significant percentage of power use and heat

generation. AMD's introduction of power management enhancements such as Dual Dynamic Power

Management and Independent Dynamic Core technology help to reduce processor power use.

However, if data center planners do not know the actual power required by the processor, they

must use the maximum power ratings listed in the engineering specifications.

To accurately measure processor power consumption, its power use must be isolated from the

power use of other components on the motherboard. To accomplish this, AMD developed specially

instrumented motherboards with voltage regulators that deliver power to individual processor

power rails. This special instrumentation allows AMD to measure processor power use of all

processor rails during standard test workloads such as floating point, integer, Web, and

transaction processing.

From these test results, AMD developed an average CPU power (ACP) metric to more accurately

estimate the power consumption of AMD Opteron processors during peak workloads (Table 3). The

ACP metric allows data centers to more accurately forecast their power requirements and reap the

benefits of lower power and cooling costs.