Messages in this thread | | | Date | Wed, 25 Sep 2013 18:14:19 -0700 | From | Arjan van de Ven <> | Subject | Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management |
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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.
yet grouping is often defeated (in current systems) due to hw level interleaving ;-( sometimes that's a bios setting though.
in internal experimental bioses we've been able to observe a "swing" of a few watts (not with these patches but with some other tricks)... I'm curious to see how these patches do for Srivatsa
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