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174 IBM NeXtScale System Planning and Implementation Guide

򐂰 C-States (Default: Enable)

This option enables dynamic processor frequency and voltage changes in the

idle state, which provides potentially better power savings.

򐂰 Package ACPI C-State Limit

Sets the higher C-state limit. A higher C-state limit allows the CPU to use less

power when they are idle.

򐂰 C1 Enhanced Mode (Default: Enable)

This option enables processor cores to enter an enhanced halt state to lower

the voltage requirement, and it provides better power savings.

򐂰 Hyper-Threading (Default: Enable)

This option enables logical multithreading in the processor so that the

operating system can run two threads simultaneously for each physical core.

򐂰 Execute Disable Bit (Default: Enable)

This option enables the processor to disable the running of certain memory

areas, which prevents buffer overflow attacks.

򐂰 Intel Virtualization Technology (Default: Enable)

This option enables the processor hardware acceleration feature for

virtualization.

򐂰 Technology Hardware Prefetcher (Default: Enable)

This option enables the hardware prefetcher. Lightly threaded applications

and some benchmarks can benefit from having it enabled.

򐂰 Adjacent Cache Prefetch (Default: Enable)

This option enables the adjacent cache line prefetch. Some applications and

benchmarks can benefit from having it enabled.

򐂰 DCU Streamer Prefetcher (Default: Enable)

This option enables the stream prefetcher. Some applications and

benchmarks can benefit from having it enabled.

򐂰 DCU IP Prefetcher (Default: Enable)

This option enables Instruction Pointer prefetcher. Some applications and

benchmarks can benefit from having it disabled.

IBM NeXtScale System User Manual

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