Feature Request: VULKAN CODE PATCH

[Maxritz]

Prerequisites

• I am running the latest code. Mention the version if possible as well.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new and useful enhancement to share.

Feature Description

I was fiddling with the Vulkan issues on rx9070 xt and it was giving me 4 - 5 TG/s .

here is a patch i had for llama.cpp earlier.. i used it to adapt and fix the beellama.cpp.

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Vulkan Performance Fix for AMD RDNA2/3/4 (RX 9070 XT and similar)
Issue: AMD RX 9070 XT (RDNA4/gfx1201) was getting only ~5 t/s decode speed on Qwen3-8B-Q4_K_M via Vulkan backend.
Root cause: AMD's proprietary Vulkan driver incorrectly reports host-visible device memory support on discrete GPUs. Without REBAR enabled, accessing host-visible VRAM from GPU is extremely slow, creating a severe bottleneck in MUL_MAT_VEC operations during decode (output projection layer).
Fix: Force device-local memory allocation by default for AMD RDNA2/RDNA3/RDNA4 discrete GPUs, bypassing the slow host-visible path.
Results: 5.4 t/s → 89-90 t/s decode (16.5x improvement), 355 t/s → 1617 t/s prompt processing (4.5x improvement).
Changes in ggml/src/ggml-vulkan/ggml-vulkan.cpp:

1. Added AMD_RDNA4 architecture detection (API version 1.4, device ID 0x7550)
2. Disabled KHR_coopmat for RDNA4 (has WMMA, not cooperative matrices)
3. Added RDNA4 to pipeline configs and row management optimizations
4. Added AMD-specific MUL_MAT_VEC workgroup size tuning
5. Set disable_host_visible_vidmem = true by default for discrete AMD RDNA GPUs

vulkan-amd-rdna4-perf-fix.patch

Motivation

Vulkan was performing really bad. I am working on fixing the PP and TG more

Possible Implementation

No response