WDDM Coherency
This automated test validates that GPU and CPU accesses to aperture segments are flushed correctly. The test ensures coherency of the data accesses between both processors.
The Windows® Display Driver Model (WDDM) coherency test invokes a test that is embedded in the Windows Vista kernel. The test validates that accesses to Accelerated Graphics Port (AGP) and Peripheral Component Interconnect (PCI) Express aperture segments are coherent and correctly cause cache flushes. To pass this test, AGP chipset drivers and video drivers must correctly flush caches when the operating system instructs them to do so.
Test details
Associated requirements |
Device.Graphics.AdapterRender.MinimumDirectXLevel Device.Graphics.WDDM.DisplayRender.Base |
Platforms |
Windows 7 (x64) Windows 7 (x86) Windows RT (ARM-based) Windows 8 (x64) Windows 8 (x86) Windows Server 2012 (x64) Windows Server 2008 R2 (x64) Windows RT 8.1 Windows 8.1 x64 Windows 8.1 x86 Windows Server 2012 R2 |
Expected run time |
~2 minutes |
Categories |
Certification Functional |
Type |
Automated |
Running the test
Before you run the test, complete the test setup as described in the test requirements: Graphic Adapter or Chipset Testing Prerequisites.
Troubleshooting
For troubleshooting information, see Troubleshooting Device.Graphics Testing.
More information
Command Syntax
| Command option | Description |
|---|---|
Coherency |
Runs the test job. |
File List
| File | Location |
|---|---|
Coherency.exe |
<[testbinroot]>\nttest\ |
Configdisplay.exe |
<[testbinroot]>\nttest\windowstest\tools\ |
TDRWatch.exe |
<[testbinroot]>\nttest\windowstest\graphics\ |