radeonsi: increase performance for DRI PRIME offloading if 2nd GPU is CIK or VI

Graphics / Mesa 3D Graphics Library / Mesa - Marek Olšák [amd.com] - 26 August 2016 08:50 UTC

SDMA is much faster for tiled->linear blits from VRAM to GTT. I have Bonaire in my second PCIe slot.

$ glxinfo | grep OpenGL.renderer OpenGL renderer string: Gallium 0.4 on AMD TONGA ...

$ DRI_PRIME=1 glxinfo | grep OpenGL.renderer OpenGL renderer string: Gallium 0.4 on AMD BONAIRE ...

Without SDMA: $ DRI_PRIME=1 glxgears 8796 frames in 5.0 seconds = 1759.074 FPS 8899 frames in 5.0 seconds = 1779.672 FPS

With SDMA: $ DRI_PRIME=1 glxgears 12765 frames in 5.0 seconds = 2552.788 FPS 12888 frames in 5.0 seconds = 2577.495 FPS

The 1st GPU is irrelevant. The improvement should be much lower at 60 fps, but definitely measurable.

SI will get this once we add SDMA blit support for it.

5ee3cac radeonsi: increase performance for DRI PRIME offloading if 2nd GPU is CIK or VI
src/gallium/drivers/radeonsi/si_blit.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

Upstream: cgit.freedesktop.org

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