tests/legacy/benchmark/sys_kernel/prj.conf

# all printf, fprintf to stdout go to console
CONFIG_STDOUT_CONSOLE=y

CONFIG_NUM_COMMAND_PACKETS=50

# eliminate timer interrupts during the benchmark
CONFIG_SYS_CLOCK_TICKS_PER_SEC=1

CONFIG_MAIN_STACK_SIZE=16384
CONFIG_LEGACY_KERNEL=y