Following the upstream discussions over -O3’ing the Linux kernel last month I ran some fresh benchmarks of the Linux kernel built with -O2 versus -O3. After the -O3 optimized kernel build results weren’t too impressive, a number of Phoronix readers were virtually shouting that “-O3 -march=native” is where it’s at for fun and performance… To appease those even though in the past it hasn’t proven worthwhile and upstream kernel developers are against it, here are those numbers…

Source: Phoronix – Benchmarking The Linux 5.19 Kernel Built With “-O3 -march=native”