HP Server rp4440 TCP Segmentation Offload (TSO) Performance On HP rp4440 Serve - Page 3

Introduction, HP PCI-X 2-Port Gigabit Ethernet Card A7012A shown

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Introduction Introduction This article highlights performance improvements available when you use HP's TCP Segmentation Offload (TSO) capabilities in conjunction with the new A7011A and A7012A 2-port Gigabit Ethernet cards (Figure 1) in a powerful server such as the HP rp4440. TSO works especially well in networks sending large amounts of data, such as in: web serving applications, data backups, or file transfer applications including NFS. TSO reduces CPU load thereby improving overall system response. Greater than 50% reduction in CPU utilization has been observed on some FTP workloads.1 Figure 1 HP PCI-X 2-Port Gigabit Ethernet Card (A7012A shown) 1. Not all applications benefit from TSO. Only data-intensive applications that transmit large data buffers using TCP over IPv4 are improved. Other types of applications will not significantly benefit from TSO. Performance improvements vary depending upon the hardware and software used. For details on recommended configurations, please refer to the section in this paper called "Technology Combinations to Use or to Be Aware Of." 3

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Introduction
3
Introduction
This article highlights performance improvements available when you use HP’s TCP Segmen-
tation Offload (TSO) capabilities in conjunction with the new A7011A and A7012A 2-port
Gigabit Ethernet cards (Figure 1) in a powerful server such as the HP rp4440.
TSO works especially well in networks sending large amounts of data, such as in: web serv-
ing applications, data backups, or file transfer applications including NFS. TSO reduces
CPU load thereby improving overall system response. Greater than 50% reduction in CPU
utilization has been observed on some FTP workloads.
1
Figure 1
HP PCI-X 2-Port Gigabit Ethernet Card (A7012A shown)
1.
Not all applications benefit from TSO. Only data-intensive applications that transmit large data
buffers using TCP over IPv4 are improved. Other types of applications will not significantly
benefit from TSO. Performance improvements vary depending upon the hardware and software
used. For details on recommended configurations, please refer to the section in this paper called
“Technology Combinations to Use or to Be Aware Of.”