Q-Logic 3000, 3100 manual Linux Performance Tuning, Performance Tools, Using the iperf Tool

8–Linux Driver Installation and Configuration Linux Performance Tuning

NOTE:

While running these tests, the network traffic will be interrupted.

Linux Performance Tuning

This section describes Linux performance tuning.

NOTE:

The tunable performance parameters are system and application specific. Understanding the relationship between the parameter values, target workload, performance applications, operating system, and system configuration provides a better understanding of performance optimization and bottlenecks.

Performance Tools

Add the following parameters for performance tuning on Linux systems in the /etc/sysctl.conf file:

net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.optmem_max = 524287 net.core.netdev_max_backlog = 250000 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 87380 16777216 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_sack = 1 net.ipv4.tcp_low_latency = 0 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_moderate_rcvbuf = 1 net.ipv4.route.flush = 1

NOTE:

Various factors including tools, kernel, stacks, and related parameters affect system performance.

Using the iperf Tool

The iperf tool measures network performance. The following paragraphs show how to use iperf; however, it can be further tuned depending on your system’s requirements.

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