[Mesa-dev] u_blitter cpu/gpu stall

[Dave Airlie]

Hi Marek,

So I was looking at some perf traces from r600g, and I see a stall on
the blitter quad vbuf, every clear will cause the CPU to block on the
mapping of the vbuf to upload the new coords. On r300g I can see this
not mattering as the immediate upload path takes care of things,
however I think we should probably do something like the attached and
fire and forget the vertex buffer.

Dave.
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