I just tried clKernel 3 and the result is this:
GPU1 The option -clKernel 3 is ignored for GPU1
2021.03.22:15:10:10.520: main Cmd line: -pool ssl://us1.ethermine.org:5555 -wal xxx -proto 3 -clkernel 3 -rmode 2 -mt 2 -mi 12
2021.03.22:15:10:10.520: main No CUDA driver found
2021.03.22:15:10:12.069: main OpenCL driver version: 21.1.1
2021.03.22:15:10:12.079: main Available GPUs for mining:
2021.03.22:15:10:12.079: main GPU1: AMD Radeon RX 6800 (pcie 3), OpenCL 2.0, 16 GB VRAM, 30 CUs
2021.03.22:15:10:18.984: GPU1 The option -clKernel 3 is ignored for GPU1
2021.03.22:15:10:19.574: GPU1 GPU1: Free VRAM: 15.922 GB; used: 0.063 GB
Any hints?
Would be great to have a word from the devs.... looks like a bug... and not sure at this point if kernel 3 needs the double size of the actual dag as stated a few msg before or not....