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ACPI SRAT Table

Common Options : Enabled, Disabled

Quick Review

The ACPI Static Resource Affinity Table (SRAT) stores topology information for all the processors and memory, describing the physical locations of the processors and memory in the system. It also describes what memory is hot-pluggable, and what is not.

The operating system scans the ACPI SRAT at boot time and uses the information to better allocate memory and schedule software threads for maximum performance. This BIOS feature controls whether the SRAT is made available to the operating system at boot up, or not.

When enabled, the BIOS will build the Static Resource Affinity Table (SRAT) and allow the operating system to access and use the information to optimize software thread allocation and memory usage.

When disabled, the BIOS will not build the Static Resource Affinity Table (SRAT). Alternative optimizations like Node Memory Interleaving can then be enabled.

If you are using an operating system that supports ACPI SRAT (e.g. Windows Server 2003, Windows XP SP2 with Physical Address Extensions or PAE enabled), it is recommended that you enable this BIOS feature to allow the operating system to dynamically allocate threads and memory according to the SRAT data.

Please note that you must disable Node Memory Interleave if you intend to enable this BIOS feature. Node Memory Interleave is a static optimization that cannot work in tandem with the dynamic optimizations that the operating system can perform using information from the ACPI SRAT.

If you are using an operating system that does not support ACPI SRAT (e.g. Windows 2000, Windows 98 ), it is recommended that you disable this BIOS feature, and possibly enable Node Memory Interleaving instead.

 

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