Windows server 2003 r2 x64 and 4gb ram

All the memory management and allocation of the PAE memory is handled by the memory manager independently of the programs that run. A program that requests 3 GB of memory is more likely to be able to have more of its memory remain in physical memory rather than be paged out. In this case, the operating system doesn't use any memory in excess of 16 GB. This behavior is caused by kernel virtual memory space considerations. AWE is a set of application programming interfaces APIs to the memory manager functions that enables programs to address more memory than the 4 GB that is available through standard bit addressing.

AWE enables programs to reserve physical memory as non-paged memory and then to dynamically map portions of the non-paged memory to the program's working set of memory. This process enables memory-intensive programs, such as large database systems, to reserve large amounts of physical memory for data without having to be paged in and out of a paging file for usage. Instead, the data is swapped in and out of the working set and reserved memory is in excess of the 4-GB range. Post navigation Previous Post.

Next Post. On December 27, Leave a Comment Cancel reply Your email address will not be published. This div height required for enabling the sticky sidebar. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses.

Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related 1. Hot Network Questions. Question feed. For devices whose drivers use "direct IO" this is most DMA devices , and assuming there is no additional OS buffering happening, there is no copying as long as your device controllers are capable of asserting bit addresses.

Otherwise, yes, there will be copying So when the requestor's buffer is physically discontiguous as it almost always is the DMA has to happen with an OS-allocated contiguous buffer, and the IO support routines copy the data between this buffer and the requestor's. This happens a LOT with consumer-oriented hardware. Exactly padster! A major design goal of this new box is to run multiple virtual machines, modeling virtual LAN s.

Given the similarity of your hardware with mine it looks like R2 may have something on Sp1. I'm wondering if it's Virtual Server or some other service or peripheral driver which is at issue. That's a contributing factor.

Why they have refused, after nearly 20 years of supporting virtual memory operating systems, to put an IOMMU in the chipsets I am not sure. A bit PCI card short connector can do bit addressing; the starting address is simply carried in two successive bus cycles. Absolutely all PCI-X cards do support bit addressing. Wow this is all quite complicated.