linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Date:	Fri, 2 Mar 2007 09:07:53 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	mgross@...ux.intel.com
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Balbir Singh <balbir@...ibm.com>, Mel Gorman <mel@...net.ie>,
	npiggin@...e.de, clameter@...r.sgi.com, mingo@...e.hu,
	jschopp@...tin.ibm.com, arjan@...radead.org, mbligh@...igh.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches

On Fri, 2 Mar 2007 08:20:23 -0800 Mark Gross <mgross@...ux.intel.com> wrote:

> > The whole DRAM power story is a bedtime story for gullible children. Don't 
> > fall for it. It's not realistic. The hardware support for it DOES NOT 
> > EXIST today, and probably won't for several years. And the real fix is 
> > elsewhere anyway (ie people will have to do a FBDIMM-2 interface, which 
> > is against the whole point of FBDIMM in the first place, but that's what 
> > you get when you ignore power in the first version!).
> >
> 
> Hardware support for some of this is coming this year in the ATCA space
> on the MPCBL0050.  The feature is a bit experimental, and
> power/performance benefits will be workload and configuration
> dependent.  Its not a bed time story.

What is the plan for software support?

Will it be possible to just power the DIMMs off?  I don't see much point in
some half-power non-destructive mode.
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