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manual abstract
HP ATM 622 and 155 Mbps Adapters for HP 9000 Enterprise
Servers and Workstations
Performance Report
Product Numbers A5483A, A5513A, and A5515A
Introduction
A series of tests were run to evaluate the performance of HP ATM 622 and 155 Mbps adapters
on various HP 9000 server and workstation platforms. The tests also measured the effect of
Classical IP and LAN Emulation interfaces, extended packet sizes, and TCP configuration
parameters on the adapter’s performance.
A second set of tests evaluated the scalability with respect to number of adapters and number of
CPUs on various HP 9000 server platforms.
This document presents the performance results and provides tuning guidelines to achieve
maximum possible performance from the ATM adapters.
Appendix A provides the Test Methodology and Environment used for the performance tests.
Test Highlights
• The 622 Mbps adapter delivers bidirectional TCP throughput in excess of 1 Gbits/sec on the
N4000 platform. This is 94% of the theoretical maximum TCP throughput for a 622 Mbps link.
• The unidirectional TCP throughput varies linearly with the number of 622 Mbps Adapters. The
TCP throughput of 4.2 Gbits/sec is achieved with eight 622 adapters on N4000 platform.
• The unidirectional TCP throughput for the 155 Mbps adapter is 134.5 Mbps, which is equal to
the theoretical maximum throughput for a 155 Mbps link.
• The TCP throughput varies linearly with the number of 155 Mbps adapters. Aggregate
bidirectional throughput of 3 Gbits/sec is achieved with twelve 155 Mbps adapters on a
V2500 and N4000 platforms.
All the results above use the Classical IP as the interface with MTU size of 9180 bytes.
Single Adapter Configuration Test Results
The theoretical maximum TCP throughput is approximately 135 Mbps for the 155 adapter and
542 Mbps for the 622 adapter. See Appendix A for calculations of the theoretical maximum TCP
throughput using protocol overhead at various layers.
Table 1 below shows the TCP throughput numbers for the N4000 platform. See Tables 4 and 5
for results on other platforms.
Table 1: Maximum TCP Throughput on N4000 (One CPU , Classical IP Interface, MTU 9180 bytes)
N4000
N4000
(155 Mbps Adapter)
(622 Mbps Adapter)
Outbound Throughput Mbps
134.45
538.14
CPU Utilization %
6.5
26.85
Inbound Throughput Mbps
132.03
535.42
CPU Utilization %
5.65
23.61
Bidirectional Throughput Mbps
260.12
1005
CPU Utilization %
11.17
57.1
Performance Report on ATM adapters, Part No. A5483A, A5513A, and A5515A
09/30/99
1
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