HP-UX 11i

Some HP-UX 11i settings can be modified to significantly improve WAS performance.

 

TCP_CONN_REQUEST_MAX

When high connection rates occur, a large backlog of TCP/IP connection requests build up and client connections are dropped. Adjust this setting when clients start to timeout after waiting to connect. This situation can be verified by issuing the netstat -p tcp command. Look for the following value: connect requests dropped due to full queue. In most cases the default (4096) should suffice. Consider adjusting to 8192 if the default proves inadequate. Set this parameter by using the ndd -set /dev/tcp tcp_conn_request_max command.

 

Java virtual machine virtual page size

Setting the Java virtual machine instruction and data page sizes to 64 MB improves performance; the default value is 4 MB. Use the command:

chatr +pi64M +pd64M 
/opt/WebSphere/AppServer/java/bin/PA_RISC2.0/native_threads/java 

The command output provides the current operating system characteristics of the process executable.

For a number of HP-UX 11i kernel parameter recommendations see the InfoCenter article "Tuning operating systems".

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