Longtime Intel Linux graphics driver engineer Lionel Landwerlin had opened this merge request today after discovering this massive optimization. That MR in turn has already landed in Mesa 22.2. The description for this Intel Vulkan RT code change is simply, “Like a 100x (not joking) improvement.”
To now the device allocation for this RT scratch memory didn’t have any allocation flags set and so presumably was getting allocated back to general system memory. Now with the “ANV_BO_ALLOC_LOCAL_MEM” flag set, it will ensure that scratch memory buffers are residing on memory local to the Intel GPU.
…does Haiku drivers of this performance “issues” too ?