Windows Vista graphics system to be overhauled

Has there been any update from Microsoft when
WDDM 2.0 will be implemented?

<quote>
However, it means that what is a Windows Vista logo-compliant machine today may not be able to
optimally run future iterations of Windows incorporating WDDM 2.0.

</quote>


http://www.apcstart.com/site/dwarne/...-be-overhauled

Microsoft is to overhaul Windows’ graphic driver model after realising that the Windows Display
Driver Model (WDDM) 1.0 — which will ship with Vista — needs improvement in the way it shares
GPU resources between programs and Windows itself.
Steve Pronovost of Microsoft’s DirectX team disclosed at WinHEC in Seattle last week that
although the WDDM 1.0 introduces some rudimentary task scheduling for GPUs, a new generation of
GPU hardware and a major architectural change to the way Windows deals with video cards will be
required.

He said that the trouble with WDDM 1.0 is that once one program is using the GPU, other
programs are shut out until the process completes. In Vista, that can cause less fluid
rendering of on-screen graphics, if multiple programs are trying to use GPU resources at once.

Until now, the inability to share GPU resources hasn’t been an obvious problem under Windows
XP, because XP uses GDI — a 2D graphics system — to draw windows and operating system interface
elements. In general, only 3D games and other major grahics apps use GPU resources, and users
only run one such app at a time, he said.

However, inadequate GPU sharing is a problem for Windows Vista, because it uses the GPU to draw
all elements of Vista’s new Aero interface, and more generally there is a trend towards using
the massive computing power in GPUs to process an array of non-graphics tasks as well.

The gotcha is that improving GPU task scheduling will require new hardware, he said. The
overhauled device driver model, WDDM 2.0, will only run on a new, yet-to-be-released generation
of GPUs. NVIDIA and ATI are already aware of Microsoft’s plans and are working on new hardware.

However, it means that what is a Windows Vista logo-compliant machine today may not be able to
optimally run future iterations of Windows incorporating WDDM 2.0.

Microsoft is also looking at a further revision of the standard, WDDM 2.1, which will run on
the same hardware as 2.0 but offer even finer-grained multitasking on the GPU.

Henry Moreton of NVIDIA said the power of GPUs was finally being tapped by application
developers. For example, he said, a Windows Vista desktop PC user could easily be running the
Windows Vista Desktop Manager (WDM), GPU-aware photo editing software, video feed viewers and
TV PVR applications simultaneously.

“Some GPU operations are so massive they take a non-trivial amount of time to complete,” he
said, “while Other GPU operations are time sensitive.”

Pronovost did not say when Microsoft expected WDDM 2.0 and 2.1 to be introduced into Windows,
and Microsoft said it “did not have any information to share” in response to an APC enquiry.

Microsoft also talked at WinHEC about how it was introducing I/O scheduling for Vista, so
disk-intensive tasks such as virus scanning or large file copy operations couldn’t cause a
system to become unresponsive.

Dan Warne travelled to Windows Hardware Engineering Conference 2006 in Seattle as a guest of
Microsoft.


--
Michael
______
"The trouble ain't that there is too many fools,
but that the lightning ain't distributed right."
- Mark Twain