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Asking the DC for less than one cacheline (4 owords) of data for
uniform pull constants is suboptimal because the DC cannot request
less than that from L3, resulting in wasted bandwidth and unnecessary
message dispatch overhead, and exacerbating the IVB L3 serialization
bug. The following table summarizes the overall framerate improvement
(with statistical significance of 5% and sample size ~10) from the
whole series up to this patch for several benchmarks and hardware
generations:
| SKL | BDW | HSW
SynMark2 OglShMapPcf | 24.63% ±0.45% | 4.01% ±0.70% | 10.31% ±0.38%
GfxBench4 gl_manhattan31 | 5.93% ±0.35% | 3.92% ±0.31% | 6.62% ±0.22%
GfxBench4 gl_4 | 2.52% ±0.44% | 1.23% ±0.10% | N/A
Unigine Valley | 0.83% ±0.17% | 0.23% ±0.05% | 0.74% ±0.45%
Note that there are two versions of the Manhattan demo shipped with
GfxBench4, one of them is the original gl_manhattan demo which doesn't
use UBOs, so this patch will have no effect on it, and another one is
the gl_manhattan31 demo based on GL 4.3/GLES 3.1, which this patch
benefits as shown above.
I haven't observed any statistically significant regressions in the
benchmarks I have at hand. Note that the comparatively huge
improvement on SKL in the OglShMapPcf test case is due to the combined
effect of this patch and the register pressure benefit on SKL+ of
"i965/fs: Switch to the constant cache for uniform pull constants.",
part of the same series.
Going up to 8 oword blocks would improve performance of pull constants
even more, but at the cost of some additional bandwidth and register
pressure, so it would have to be done on-demand based on the number of
constants actually used by the shader.
v2: Fix for Gen4 and 5.
v3: Non-trivial rebase. Rework to allow the visitor specifiy
arbitrary pull constant block sizes.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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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.