Magnus Fromreide wrote: > 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? > I don't think it ever made the light of day other than a few patches on lkml that people hated. No matter what it needs a special bios, and probably even a chipset thats capable of doing this.
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