Documentation/scsi/link_power_management_policy.txt

   1 This parameter allows the user to set the link (interface) power management.
   2 There are 3 possible options:
   3
   4 Value                   Effect
   5 ----------------------------------------------------------------------------
   6 min_power               Tell the controller to try to make the link use the
   7                         least possible power when possible.  This may
   8                         sacrifice some performance due to increased latency
   9                         when coming out of lower power states.
  10
  11 max_performance         Generally, this means no power management.  Tell
  12                         the controller to have performance be a priority
  13                         over power management.
  14
  15 medium_power            Tell the controller to enter a lower power state
  16                         when possible, but do not enter the lowest power
  17                         state, thus improving latency over min_power setting.
  18
  19