Comment # 222 on bug 111481 from Marko Popovic

(In reply to William Casarin from comment #221)
> mesa 19.3.0-rc2 + RADV_PERFTEST=aco fixed this for me

ACO should have no impact on SDMA. Firstly OpenGL still uses LLVM, and OpenGL
is the only one using SDMA in the first place, radv doesn't. So you must be
talking about some different kinds of hangs, probably the ring_gfx types.