Vulkan VK_KHR_cooperative_matrix performance of Intel Xe2 arch GPUs (B580 & LNL)

[asto18089]

According to this issue: #12690
and this commit: b56f079

It looks like Intel GPUs do support using matrix cores in Vulkan inference, but it got disabled since actual performance is worse and not easily sorted out why.
However, that assumption is made using A-series cards but not latest B-series Xe2 cards. After a rough search, I also cannot find anyone done such experiments. Are there any performance numbers out there? Or are anyone willing to give it a try?

[0cc4m]

I only have an A770 so that's what I'm limited to for tests, but if someone has a B580 (or other Battlemage card) and wants to give it a shot, I can give instructions. They would have to build the project manually with slight code changes.