Re: [Results] [RFC PATCH v4 00/40] mm: Memory Power Management

From: Andrew Morton
Date: Wed Sep 25 2013 - 19:41:05 EST

On Thu, 26 Sep 2013 04:56:32 +0530 "Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx> wrote:

> Experimental Results:
> ====================
> Test setup:
> ----------
> x86 Sandybridge dual-socket quad core HT-enabled machine, with 128GB RAM.
> Memory Region size = 512MB.

Yes, but how much power was saved ;)

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.

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