[Mesa-dev] glxgears performance higher with software renderer compared to h/w drivers

[Patrick Baggett]

I don't think glxgears is the best benchmark for what is a "typical" OpenGL
load (if there is a "typical"). The 60 FPS with your hardware driver sounds
suspiciously like the refresh rate of your screen; perhaps it is
synchronized with the vertical retrace? Since I'm assuming you want to find
the fastest driver, why not try a free and open source game like openarena
to give you a better idea of how they actually perform.


Patrick


On Mon, May 6, 2013 at 9:33 AM, Divick Kishore <divick.kishore at gmail.com>wrote:

> Hi,
>      I am trying to build s/w only mesa driver. It seems that the
> performance of software only renderer (compiled with
> --with-driver=xlib) is higher than that of h/w drivers. Could someone
> please help me understand what is causing this or if it is expected?
>
> I see that dri based s/w renderer is also slower than xlib/swrast
> driver. So how does dri based s/w rendering work and why is it slower
> than xlib/swrast driver?
>
> I presume that --with-driver=xlib builds s/w only renderer. Please
> correct me if I am wrong.
>
> ./configure -build=x86_64-linux-gnu --with-driver=dri
> --with-dri-drivers="i915 swrast"
>
> --with-dri-driverdir=/home/divick/work/mesa/mesa-8.0.5/build/dri/x86_64-linux-gnu/
>
> --with-dri-searchpath='/home/divick/work/mesa/mesa-8.0.5/build/dri/x86_64-linux-gnu/'
> --enable-glx-tls --enable-shared-glapi --enable-texture-float
> --enable-xa --enable-driglx-direct --with-egl-platforms="x11 drm"
> --enable-gallium-llvm --with-gallium-drivers="swrast i915"
> --enable-gles1 --enable-gles2 --enable-openvg --enable-gallium-egl
> --disable-glu CFLAGS="-Wall -g -O2" CXXFLAGS="-Wall -g -O2"
>
> with LIBGL_ALWAYS_SOFTWARE=1
> glxgears reports:
>
> GL_RENDERER   = Software Rasterizer
> GL_VERSION    = 2.1 Mesa 8.0.5
> GL_VENDOR     = Mesa Project
>
> fps: ~ 490 fps
>
> Without LIBGL_ALWAYS_SOFTWARE set:
>
> GL_RENDERER   = Mesa DRI Intel(R) Sandybridge Mobile
> GL_VERSION    = 3.0 Mesa 8.0.5
> GL_VENDOR     = Tungsten Graphics, Inc
>
> fps: ~ 60
>
> When compiled with configure options
>
>  --build=x86_64-linux-gnu --disable-egl --with-gallium-drivers=
> --with-driver=xlib --disable-egl CFLAGS="-Wall -g -O2" CXXFLAGS="-Wall
> -g -O2"
>
> glxgears reports:
>
> GL_RENDERER   = Mesa X11
> GL_VERSION    = 2.1 Mesa 8.0.5
> GL_VENDOR     = Brian Paul
>
> fps: ~1600
>
> With drivers installed on system and with LIBGL_ALWAYS_SOFTWARE=1:
>
> GL_RENDERER   = Gallium 0.4 on llvmpipe (LLVM 0x209)
> GL_VERSION    = 2.1 Mesa 8.0.5
> GL_VENDOR     = VMware, Inc.
>
> fps: ~ 1130
>
> Thanks & Regards,
> Divick
> _______________________________________________
> mesa-dev mailing list
> mesa-dev at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
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