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Understanding PCIe Root Complex Connections
Slot 16
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A root complex is the CMP circuitry that provides the base to a PCIe I/O fabric. Each PCIe I/
O fabric consists of the PCIe switches, PCIe slots, and leaf devices associated with the root
complex. Understanding the relationship of the PCIe root complexes to the PCIe I/O fabrics
will help you properly assign devices when configuring Oracle VM Server for SPARC logical
domains.
This diagram illustrates the root complex connections between the four CPUs and the 16 PCIe
I/O slots. Each CPU supports all I/O root complex fabrics. In single-PM configurations, all
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SPARC T8-4 Server Service Manual • January 2022
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