Hi... On Mon, Jun 13, 2011 at 15:26, naveen yadav <yad.naveen@xxxxxxxxx> wrote: > Dear All, > > We are using ARM cortex a9. In below scenario, I want help. May I take x86 as point of view here? > Multi-Core Power Saving > Hot plug feature allows for making a processor offline and let the > system run as if there is only a single core. > Now,comes the scenario - Let there are '2' cores in the system both > running at a load of 40% (i.e. total load 80%), now in this case > ideally '1' CPU is sufficient. > So, if we make 2nd Core offline that will make the system execute > everything on core '1'. The thing is, you need to measure the real frequency step or, to be precide, C/P state. If that 80 % on single processor, let's say brought processor into highest C and P state *all the time*, there is a chance the power consumption exceed 2 processor that by average in mid or low C/P state (and they got chance to get idle more often too). So physically, I agree 1 processor consume less power than 2 processor. But that depends entirely on the load. And, I believe it also depends on which power scaling governor you use too. > But will there be any power saving if we make any core offline under > scenarios like this? Or will this have extra overhead? > What are the pros and cons of working like this on Multi-Core? > > Regards > Naveen > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
