WDDM Coherency

  • Article

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

   
Specifications
  • Device.Graphics.AdapterRender.MinimumDirectXLevel
  • Device.Graphics.WDDM.DisplayRender.Base
Platforms
  • Windows 10, client editions (x86)
  • Windows 10, client editions (x64)
  • Windows Server 2016 (x64)
  • Windows 10, client editions (Arm64)
Supported Releases
  • Windows 10
  • Windows 10, version 1511
  • Windows 10, version 1607
  • Windows 10, version 1703
  • Windows 10, version 1709
  • Windows 10, version 1803
  • Windows 10, version 1809
  • Windows 10, version 1903
  • Next update to Windows 10
Expected run time (in minutes) 2
Category Compatibility
Timeout (in minutes) 120
Requires reboot false
Requires special configuration false
Type automatic

 

Additional documentation

Tests in this feature area might have additional documentation, including prerequisites, setup, and troubleshooting information, that can be found in the following topic(s):

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 generic troubleshooting of HLK test failures, see Troubleshooting Windows HLK Test Failures.

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\

 

Parameters

Parameter name Parameter description
LLU_NetAccessOnly LLU Name of net user
ConfigDisplayCommandLine Custom Command Line for ConfigDisplay. Default: logo
TDRArgs /get or /set