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Executive Summary
This document presents the performance characteristics and capabilities of the recently announced HP Fabric
Clustering System for InfiniBand cluster interconnect product on HP-UX 11iv2 platforms.
The HP-UX Fabric Clustering System product consists of:
• AB286A - HP PCI-X 2-port 4X Fabric (HPC) Host Channel Adapter (HCA)
• AB291A – HP 12-port 4X Fabric Copper Switch
• 5m, 7m, and 10m 4x Fabric Copper Cables
• HP-UX Fabric Clustering System software stack
HP also lists a reference 96-port 4X IB Switch, the Topspin TS170.
Performance Overview
The following three attributes that affect the scalability of a cluster interconnect solution form the heart and soul of
performance characterization of any cluster interconnect solution. The HP-UX Fabric Clustering System interconnect
solution shows industry leading numbers on all the three fronts:
• Latency
HP-UX Fabric Clustering System product offers 1-way latency of 4.6usec for 8-byte messages in RDMA
programming model, and sub-10usec latencies for short messages of length 512 or less in both
Send/Receive and RDMA programming models.
• Bandwidth
HP-UX Fabric Clustering System product offers near link rate receive side bandwidth (an aggregate of
924MB/s for 3 parallel streams) limited only by the PCI-X point of attachment.
• Service Demand
HP-UX Fabric Clustering System product completely leverages the offload and OS-bypass features offered by
the InfiniBand technology which yields lower CPU utilization while transferring large messages. The service
demand is 9% for 64KB messages and is under 5% for 128KB or larger messages.
This is a living document. The document will be periodically updated with the latest performance data on newer
platforms and currently addresses any performance issues found thus far. The reader is encouraged to get the latest
version available at the HP website http://docs.hp.com.
Document Structure
This document is organized as follows:
Section 1 contains the executive summary and organization of this paper.
Section 2 outlines the test methodology, tools, and performance considerations as used in generating the
performance results listed in this paper.
Section 3 presents the HP-UX Fabric Clustering System interconnect solution performance results in point-to-point
configurations.
Section 4 presents the HP-UX Fabric Clustering System interconnect solution performance results in switched
configurations.
Section 5 lists the configurations on HP Integrity servers not suited for a high performance Fabric Clustering System
solution.
Section 6 summarizes the results.
Methodology
An HP-developed application, itperf, was used for driving the data on the cluster. itperf was used to measure latency,
bandwidth and bi-directional bandwidth across the tested topologies. Service demand generated on the servers was
also measured while running the tests. HP Integrity servers rx2600 and rx4640 are used as the data source and sink
for performance measurements. Various topologies are used for characterizing the cluster interconnect performance;
these include both point-to-point and switched configurations.
Performance aspects of non-optimal configurations are listed in the whitepaper to help system administrators avoid
configuration mistakes.
Confidential
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1/28/2005
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