Sun Java System Web Server 6.1 SP12 Performance Tuning, Sizing, and Scaling Guide

NativePoolMaxThreads

NativePoolMaxThreads determine the maximum number of threads in the native (kernel) thread pool.

A higher value allows more requests to execute concurrently, but has more overhead due to context switching, so bigger is not always better. Typically, you will not need to increase this number, but if you are not saturating your CPU and you are seeing requests queue up, then you should increase this number.

Tuning

You can modify the NativePoolMaxThreads by: