Hello, We used to run core 18 and our app on RPI3B V1.2. This works properly but we need to add more and more algorithm and we decided to move on RPI4B. While a gain of performance is attended, results disapoint us. While sysbench shows a large improvement between rpi3b and rpi4b; running our applications do not show the same factor of enhancement.
So maybe our app doesn’t take benefits of arm72 architecture?
Do you have any hints in terms of optimisation flag for GCC?
We juste use -O3.
Does the pi-kernel is optimized for the architecture? pi-kernel snap info show that there’s kernel dedicated for pi4 we tried to rebuild the OS targeting this kernel but the system stucks at splash screen.
Removing the quiet splash shows the following: first gpu boots, then rainbow screen is shown, then 4 raspberry appear on the left upper side corner on the screen and then black screen and no activity, just the green led heart beat.
Any idea? does anyone succeed to use the pi4-kernel (version77).