Hibernatning RAM

[Magnus Fromreide]

On lör, 2008-03-15 at 08:43 -0700, Arjan van de Ven wrote:
> Magnus Fromreide wrote:
> > Hello.
> > 
> > I have two memory modules in my computer (.5G+1G) but usually I use a
> > lot less memory than 1G that so I would like to ask:
> >       * Is it possible to tell the system to shut down part of the main
> >         memory in order to save power?
> >       * Can I do it from Linux?
> >       * How?
> 
> this is not an easy task. The way dram normally works is that both dimms
> get interleaved over memory (so alternating pieces of the memory come from
> different dimms) for performance reasons......

This sounds complicated when there are differently sized and timed dimms
involved.

> however this also means it's not possible to just turn one dimm off.
> 
> there is some research being done on systems with many dimms, to make the interleave less
> (say from across-8 to across-4) and then be able to turn a few dimms off, but on a 2-dimm
> situation... I've not heard of that yet.

Ok, thanks for telling anyway, this is quite interesting.

Do you know where I could find mre information about this?

/MF