Hi, all, I just identified the problem. I use Intel VTune Amplifier for profiling and it asks me to disable C-States to avoid system hanging. Today, I popped up the idea to try to enable it and checked the numa information again. It is o.k.! So, C-States is critical for NUMA in Nehalem Architecture? I don't know if it is always the case or just the case on my model. David On Wed, Jun 22, 2011 at 2:13 PM, Chia-Hung Lin <ch1028.lin@xxxxxxxxx> wrote: > Hi, > > I don't know if this post is appropriately for this board. (If not, > which forum should I post to?) > > I am wondering if my machine is configured right. > My machine equipped with two Intel Xeon E5640 CPUs (each has 4 cores). > The red hat version is Red Hat Enterprise 5.5 and linux kernel is > 2.6.18-194.el5 > My question is when I check /sys/devices/system/node, there is only > one node0 directory. > The information displayed by "numactl --show" is > policy: default > preferred node: current > physcpubind: 0 1 2 3 4 5 6 7 > cpubind: 0 > nodebind: 0 > membind: 0 > > Why there is only one node instead of two? Is there any thing wrong > with my machine? > Also, I found a message in dmesg : > No NUMA configuration found > Faking a node at 0000000000000000-0000000318000000 > > What should be a NUMA configuration look like? > Another thing I think strange is the BIOS setting. Its default is SMP. > When I try to change it to NUMA, I can only see one CPU after re-booting. > Is it normal? (the machine model is Dell T5500) > It will be very helpful if you can give me some direction. > > Thanks a lot. > > David Lin > -- To unsubscribe from this list: send the line "unsubscribe linux-numa" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
