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This is a direct port of Marek Olšáks patch "radeonsi: increase performance for DRI PRIME offloading if 2nd GPU is CIK or VI" to r600. It uses SDMA for the detiling blit from renderoffload VRAM to GTT, as SDMA is much faster for tiled->linear blits from VRAM to GTT. Testing on a dual Radeon HD-5770 setup reduced the time for the render offload gpu to get its rendering into system RAM from approximately 16 msecs for simple rendering at 1920x1080 pixel 32 bpp to 5 msecs, a > 3x speedup! This was measured using ftrace to trace the time the radeon kms driver waited on the dmabuf fence of the renderoffload gpu to complete. All in all this brought the time for a flip down from 20 msecs to 9 msecs, so the prime setup can display at full 60 fps instead of barely 30 fps vsync'ed. The current r600 implementation supports SDMA on Evergreen and later, but not R600/R700 due to some bugs apparently present in their SDMA implementation. Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Cc: Marek Olšák <marek.olsak@amd.com> Signed-off-by: Marek Olšák <marek.olsak@amd.com> |
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File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see http://www.mesa3d.org/repository.html - run scons General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.