piotraf

Hi, Both will work. If you leave haswell you'll be fine. According to the below: https://en.wikichip.org/wiki/intel/microarchitectures/kaby_lake it should be: -march=skylake I always check the output with the compiler (you can check booting livecd sysrecuecd) gcc -march=native -E -v - </dev/null 2>&1 | grep cc1 or if you wish:[ CFLAGS ] put this in make.conf CFLAGS="-O2 -pipe -march=native" CXXFLAGS="${CFLAGS}" and rebuild world. It shouldn't take long. ;-)