HP-UX TCP/IP Performance White Paper, March 2008

6.3.3 Key issues for throughput with Netperf traffic

Common issues for throughput for netperf transfer are the following:

• Throughput is limited by the speed of the slowest link in the path from host A to host B.

• The transaction rate is limited by the network latency between host A and host B.

• High CPU utilization can also be the limiting factor for bulk transfer throughput, or can result in

additional latency for request/response transactions.

6.4 Additional Monitoring Tools

Additional HP-UX tools are available for monitoring network performance:

• intctl(1M) display and modify the interrupt configuration of the system

• ioscan(1M) display hardware configuration paths including processors, disks, and

Ethernet adapter

• lanscan(1M) display LAN device configuration and status

• nettl(1M) network tracing and logging

• nwmgr(1M) network interface manager command (11i v3)

• ping(1M) shows round trip latency and the hops to get from point A to B.

• sar(1M) system activity reporter which is useful for monitoring CPU, memory and

disk I/O

• tcpdump(1) display packet headers on a network interface

• top(1) display and update information about the top processes on the system

• traceroute(1) display the route packets take to network host

Note: With the introduction of nwmgr(1M), the lanadmin(1M), lanscan(1M), and linkloop(1M)

commands are deprecated. These commands will be removed in a future HP-UX release.