Re: The performance and behaviour of the anti-fragmentation relatedpatches

[Andrew Morton]

On Fri, 2 Mar 2007 08:20:23 -0800 Mark Gross <mgross@xxxxxxxxxxxxxxx> 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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