Displaying 1 result from an estimated 1 matches for "nouveau_screen_bo_del".
2009 Dec 27
2
[Bug 25806] New: NV40 vertex corruption (kernel BO deletion too early?)
...ux 2.6.33-rc2
libdrm 2.4.17
Mesa HEAD (b46bcd8e7b37aa2e9159e126c1cc88234a3c2790)
Detected an NV40 generation card (0x049800a2)
64 MB GART aperture
256 MB VRAM
The problem is solved by either of the following:
1. #define FORCE_SWTNL 1
2. Adding usleep(10000) at the end of nv40_draw_arrays
3. Making nouveau_screen_bo_del do nothing
It seems that the issue is that Mesa deletes a buffer object used for vertex
data while the GPU is still drawing to it. The kernel actually performs the
deletion without waiting for the GPU drawing, the memory (or GART mapping) is
reused, and corruption ensues.