High throughput and other performance reasons require you to operate the SAP XI application in a cluster environment. Cluster communication then becomes an important factor so that all the server nodes are operating in a harmonious way. If you are using AIX as the operating system, you can improve the cluster communication by tuning tcp_nodelayack. If you set this option to 1, it prompts TCP to send an immediate acknowledgement, instead of waiting for 200 ms (default delay).
Run the following commands as root user:
To check the current setting:
no -o tcp_nodelayack
To set the option temporarily:
no -o tcp_nodelayack=1
To set the option permanently:
no -p -o tcp_nodelayack=1
For more details on this parameter check IBM's documentation. Read AIX 5L Administration if looking for learning AIX basics.