NUMA Proximity Domains

The ACPI tables include topology information for all processors and memory that is present in an operating system at system boot. The ACPI tables also contain information for memory that can be added while the operating system is running without requiring a reboot. The information identifies sets of logical processors and physical memory ranges. This information enables a tight coupling between logical processors and memory ranges. Each coupling is referred to as a proximity domain. The latency of memory accesses by logical processors within the same proximity domain is typically shorter than the latency of accesses outside of the proximity domain. The root partition can relay this affinity information to the hypervisor by selecting memory resources or specifying the proximity domain to be used with certain hypercalls.

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Build date: 11/16/2013