On Wed, 8 Jul 2009 21:49:00 -0600 lee <l...@yun.yagibdah.de> wrote: > Hi, > > under what circumstances are you supposed to turn on NUMA support in > the kernel settings? I've googled about that and learned what NUMA is > about while trying to answer the question wheather I should enable it > in my kernel or not. But I couldn't find the answer I was looking for. > > Do Intel DualCores (E8400) support NUMA? Do you need special hardware, > like a special mainboard supporting NUMA, to benefit from this > feature? Do these CPUs support NUMA? It seems to me that leaving it > disabled is better in my case, and the kernel help also says that it's > probably better not to enable it if you don't have more than two > CPUs/cores. > > Now if I had a quad core CPU instead, would I better enable NUMA? Or > if I had an AMD instead of Intel, would I turn it on? Or should I > leave it turned on? > >
A good first answer is that if you don't know what NUMA is then you don't need it. If you want a more precise answer what NUMA is: NUMA = non uniform memory access. It means that each cpu connects directly to it's local memory and slowly (via some communication channel) to other memory. The closest you would get with a desktop box (which I don't think is possible yet) would be with a dual CPU core i7 (note, dual cpu, not dual core), since corei7 has it's own memory controller. Core 2 duo connects via the north side bus and thus even with two CPUs they still connect to the same memory via the north side bus. If you have a multi CPU opetron system they also are NUMA systems. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
