Architecture/Technology Overview

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8-way Architecture Overview

The HP NetServer LXr 8500, an 8-way capable server, is based on the Intel Profusion

chipset: a tightly coupled, multi-ported symmetric multi-processing system architecture

(see Figure 2). The multi-ported system controller enables simultaneous communications,

via dual 64-bit wide buses, between any combination of eight CPUs, four I/O bridges and

up to 32 GB of shared memory. There are three system (P6) buses in this design, two

dedicated to the CPUs and one to system I/O. Each of these buses runs at 100 MHz,

800 MB/s. To assure data integrity and improve system performance, a novel cache

coherency mechanism is employed to reduce conflicts for access across the buses. The

Profusion chipset makes the HP NetServer LXr 8500 equally effective whether the

application is memory-intensive, data-intensive or processor-intensive.

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The Profusion system controller allows direct point-to-point, simultaneous access to all

system resources, producing a balanced server platform. Two processor buses and

innovative cache coherency filters reduce CPU overhead and traffic, providing maximum

processor scalability. In addition, dual-memory bus architecture has been included to

reduce memory bottlenecks and provide memory scalability. Finally, four multi-peer PCI

bridge chips provide the LXr 8500 system with four separate peer PCI buses. Each PCI