[linux-2.6-block.git] / Documentation / scsi / link_power_management_policy.txt

This parameter allows the user to set the link (interface) power management.
There are 3 possible options:

Value			Effect
----------------------------------------------------------------------------
min_power		Tell the controller to try to make the link use the
			least possible power when possible.  This may
			sacrifice some performance due to increased latency
			when coming out of lower power states.

max_performance		Generally, this means no power management.  Tell
			the controller to have performance be a priority
			over power management.

medium_power		Tell the controller to enter a lower power state
			when possible, but do not enter the lowest power
			state, thus improving latency over min_power setting.
Commit	Line	Data
ca77329f KCA	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