With ASP.NET 2.0, the process model (processModel) section of machine.config comes with default value of autoconfig="true".
This means that the tuning parameters will be set automatically by ASP.NET engine based on machine configuration.
The parameters considered for auto tuning are :
The maxWorkerThreads attribute.
The maxIoThreads attribute.
The minFreeThreads attribute of the httpRuntime element.
The minLocalRequestFreeThreads attribute of the httpRuntime element.
The maxConnection attribute of the <connectionManagement> Element (Network Settings) element.
Their values are determined based on logic mentioned at following link.