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    SubjectRe: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management
    On Wed, 25 Sep 2013 18:15:21 -0700 Arjan van de Ven <arjan@linux.intel.com> wrote:

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