Sun Java System Web Server 6.1 SP7 Performance Tuning, Sizing, and Scaling Guide

Keep-Alive Subsystem Tuning

The keep-alive (or HTTP/1.1 persistent connection handling) subsystem in Sun Java System Web Server 6.1 is designed to be massively scalable. The out-of-the-box configuration can be less than optimal if the workload is non-persistent (that is, HTTP/1.0 without the KeepAlive header), or for a lightly loaded system that’s primarily servicing keep-alive connections.

There are several tuning parameters that can help improve performance. Those parameters are listed below:

HTTP/1.0-style Workload

Since HTTP/1.0 results in a large number of new incoming connections, the default acceptor threads of 1 per listen socket would be suboptimal. Increasing this to a higher number should improve performance for HTTP/1.0-style workloads. For instance, for a system with 2 CPUs, you may want to set it to 2.