The following is a demonstration of the inttimes.d script,
 
 
 Here we run it for a few seconds then hit Ctrl-C,
 
    # inttimes.d
    Tracing... Hit Ctrl-C to end.
    ^C
         DEVICE           TIME (ns)
           ata0              22324
          uhci1              45893
           ata1             138559
          uhci0             229226
         i80420            1305617
          rtls0            2540175
 
 In the above output, we can see that the rtls0 driver spent 2540 us on the
 CPU servicing interrupts, while ata0 spent only 22 us.