[Mesa-dev] [PATCH 00/26] RadeonSI: Primitive culling with async compute

[Marek Olšák]

I have some fixes for Sea Islands that improve Radeon 290X performance to
43 fps, moving it just below Radeon VII in the picture.

Marek

On Wed, Feb 13, 2019 at 12:16 AM Marek Olšák <maraeo at gmail.com> wrote:

> Hi,
>
> This patch series uses async compute to do primitive culling before
> the vertex shader. It significantly improves performance for applications
> that use a lot of geometry that is invisible because primitives don't
> intersect sample points or there are a lot of back faces, etc.
>
> It passes 99.9999% of all tests (GL CTS, dEQP, piglit) and is 100% stable.
> It supports all chips all the way from Sea Islands to Radeon VII.
>
> As you can see in the results marked (ENABLED) in the picture below,
> it destroys our competition (The GeForce results are from a Phoronix
> article from 2017, the latest ones I could find):
>
> Benchmark: ParaView - Many Spheres - 2560x1440
> https://people.freedesktop.org/~mareko/prim-discard-cs-results.png
>
>
> The last patch describes the implementation and functional limitations
> if you can find the huge code comment, so I'm not gonna do that here.
>
> I decided to enable this optimization on all Pro graphics cards.
> The reason is that I haven't had time to benchmark games.
> This decision may be changed based on community feedback, etc.
>
> People using the Pro graphics cards can disable this by setting
> AMD_DEBUG=nopd, and people using consumer graphics cards can enable
> this by setting AMD_DEBUG=pd. So you always have a choice.
>
> Eventually we might also enable this on consumer graphics cards for those
> games that benefit. It might decrease performance if there is not enough
> invisible geometry.
>
> Branch:
> https://cgit.freedesktop.org/~mareko/mesa/log/?h=prim-discard-cs
>
> Please review.
>
> Thanks,
> Marek
>
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