Messages in this thread | | | Date | Wed, 22 Apr 2015 10:51:57 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH 3/3] libata: Change medium_power LPM policy to match Intel recommendations |
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On Sat, Apr 18, 2015 at 08:26:36AM -0700, Matthew Garrett wrote: > Intel publish a document on designing energy efficient SATA devices at > http://www.intel.com/content/dam/doc/reference-guide/sata-devices-implementation-recommendations.pdf > which recommends that ALPE be set, ASPE be cleared and that DIPM be enabled > on the device. Right now we have no policy that matches that - medium_power > does not enable DIPM and min_power sets ASPE. Change medium_power to > implement these recommendations, with the addition of devslp state being > inherited from the initial configuration. With luck this will provide > reasonable power savings without causing the device breakages we > occasionally see with the min_power policy.
Can we add comment explaining what med_power implements and link to the above?
Thanks.
-- tejun
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