RADV Driver Lands "Highly Experimental" Transfer Queue Support

[phoronix]

Phoronix: RADV Driver Lands "Highly Experimental" Transfer Queue Support

Thanks to Valve's open-source developers, the Mesa Radeon Vulkan driver "RADV" has landed experimental support for transfer queues for facilitating SDMA image copies...

https://www.phoronix.com/news/RADV-Experimental-Xfer-Queues

[MastaG]

So when the other requirements are merged, what type of games or workloads will benefit from transfer queues?

[LtdJorge]

So when the other requirements are merged, what type of games or workloads will benefit from transfer queues?

From the RDNA performance guide:

In addition to having a compute queue, GCN and RDNA also have dedicated copy queues. These copy queues map to special DMA engines on the GPU that were designed for maximizing transfers across the PCIe® bus. Vulkan and DX12 give direct access to this hardware though the copy/transfer queues.

• Use the copy queue to move memory over PCIe.
  • This is marginally faster than the other queues.
  • It allows independent graphics and compute work to run without waiting.
  • The copy queue can also move memory around on the GPU and may be used to defrag memory asynchronously.
• Use compute or graphics queues to copy when both:
  • The destination and source are on the GPU.
  • The result is needed immediately or the queue is otherwise idle.

So I guess only games that use the specific Vulkan functionality, but as always, it's positive.