On Wed, 25 Sep 2013 18:15:21 -0700 Arjan van de Ven [off-list ref] wrote:

On 9/25/2013 4:47 PM, Andi Kleen wrote:

quoted

quoted

Also, the changelogs don't appear to discuss one obvious downside: the
latency incurred in bringing a bank out of one of the low-power states
and back into full operation.  Please do discuss and quantify that to
the best of your knowledge.

On Sandy Bridge the memry wakeup overhead is really small. It's on by default
in most setups today.

btw note that those kind of memory power savings are content-preserving,
so likely a whole chunk of these patches is not actually needed on SNB
(or anything else Intel sells or sold)

(head spinning a bit).  Could you please expand on this rather a lot?

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