Mesa Radeon Vulkan Driver "RADV" Works Around Bugs For Unreal Engine 4 & 5

[ResponseWriter]

marked for back-porting to the Mesa 23.3/23.2 stable series

Any sign of further releases in the 23.2 series?

[Kjell]

I basically use RADV_ZERO_VRAM=false with literally any game. It either does nothing or it improves framepacing.

It also seems to impact DX12 titles (not UE4/5 DX12 necessarily) way more than DX11 titles.

Isn't that the default?

[ATFx]

AMD's driver on Windows Zero's Vram by Default.

Who knows why they're telling the driver to zero vram for specific applications instead
of fixing all known & unknown issues caused by not having the Driver on Linux do the same.

They'd rather Keep adding Exceptions to that List.

[smitty3268]

Who knows why they're telling the driver to zero vram for specific applications instead

Performance. It's not like it's a secret.

They are doing this by checking for the engine name, by the way, not specific application names. That's one thing Vulkan improved over OpenGL, so they don't have to update this every time a new Unreal game comes out.

[ATFx]

Performance. It's not like it's a secret.
by the way, not specific application names.

Incorrect, it only applies to the Engines, not the Games. Which are both types of apps anyway.

https://gitlab.freedesktop.org/mesa/mesa/-/blob/bb92c34c2859c2f5b42c9b6ba4f5603d79b72d33/src/util/00-radv-defaults.conf

Having Radv Zero Vram fixes any Application that does not Properly Handle its own Cache & Hardware is more then Capable of Operating.
With how Performant AMD's Hardware is in general & only Gets more these things are inconvenient & inefficient.
These Developers Treat Linux like its inherently Dysfunctional & Incapable of doing anything as much as HW.
So much they actually Disadvantage, it's Performance & Appeal.

[stalkerg]

Did somebody add such an issue to Ue4/ue5 bug tracker?

[smitty3268]

Incorrect, it only applies to the Engines, not the Games. Which are both types of apps anyway.

I think you misread my post, because that's exactly what I said.