Non-Paged Pool

This is the second part of a mini-series on Windows x64, focusing on behind the scene changes in the operating system. In the first article I explained key concepts of the x86 platform, namely that user-mode processes each get 4 GB of virtual address space, but can use only half of it, because 2 GB are used for the operating system kernel.

I will start this blog with a small series of posts that describe changes to the architecture of Windows Server 2008 that are relevant to Terminal Services. Dynamic Kernel Address Space The number of users a Terminal Server can host is in most cases limited by the amount of free kernel memory, especially the free memory in the following areas: