trunk/lttv/lttv/modules/gui/interrupts/README

   1
   2 CPUID: processor ID
   3
   4 IrqId: IRQ ID
   5
   6 Frequency (Hz): the number of interruptions per second (Hz)
   7
   8 Total Duration (nsec): the sum of each interrupt duration in nsec
   9
  10 Duration standard deviation (nsec):   taken from
  11 http://en.wikipedia.org/wiki/Standard_deviation
  12 Duration Standard_deviation  = sqrt(1/N Sum ((xi -Xa)^2)) where
  13 N: the total number of interrupts
  14 xi: the duration of an interrupt
  15 Xa: the average duration is the total duration divided by the total number of interrupts (N)
  16
  17 Max IRQ handler duration (nsec) [time interval]:   the longest IRQ handler duration in nsec.
  18
  19 Average period (nsec): 1/Frequency
  20
  21 Period Standard_deviation  = sqrt(1/N Sum ((xi -Xa)^2)) where
  22 N:  number of interrupts
  23 xi: duration of an interrupt
  24 Xa: Average period in nsec