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. >
btw what you think of as "1 Dimm" is electrically often a set of dram sets; it's not quite "a 1Gb dimm is 2 512Mb dimms on the same circuit board", but it's often not all that far from the truth either. As for different timings... much all systems I've worked with on this level (arguably that's servers, I hardware-tweak laptops a lot less ;-) end up using the most common denominator (read: slowest of the dimms) as the speed for all of them. It's quite possible that in the mobile/desktop space this is different... I'm just not familiar with this detail on that class of hw. _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
