The bandwidth between system memory and VRAM is very limited on G200. So when using a 32bit framebuffer on system memory, convert it to 24bit when copying the frame to the VRAM, this allows to go 33% faster. Converting the format on the fly is negligible, even on low end CPU.
[PATCH 1/2] drm/mgag200: simplify offset and scale computation. [PATCH 2/2] drm/mgag200: Use 24bit format in VRAM drivers/gpu/drm/mgag200/mgag200_mode.c | 87 ++++++++++++++++++++++++++++++++++++--------------------------------------------------- 1 file changed, 36 insertions(+), 51 deletions(-)
