@rschell Maybe of any help or just sharing my knowledge: I found that using command stress would give me best results when it comes to testing boost speeds. In combination with using cpuset for targeting specific cores (P-cores and/or E-cores).
Installing stress:
pkg install stress rehashCommand cpuset -l 0-3 stress -c 4 would (if hyper-threading is enabled) stress both P-cores with 4 worker processes.