Hibernatning RAM

[Arjan van de Ven]

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......
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.