It is worth to remember that the use of <code>powersave</code> governor '''has a drawback in terms of system reactivity''', because processor is relatively slow to get out of the idle condition. This can lead to phenomena such as the UART RX FIFO overrun, shown in the following box{{efn|This is the same issue described [[Linux_and_interrupt_latency_(Axel)#A_real-word_case:_UART_RX_FIFO_overrun|here]].}}.: