Thanks Keunhong. How do i get the motherboard spec on a virtual machine thats spawned on the cloud, for example Amazon EC2?
Cheers, Abhishek On Mon, Jun 29, 2015 at 4:53 AM, Keunhong Lee <dlrmsghd at gmail.com> wrote: > See your motherboard spec. > For example, I'm using Intel 5930K with ASUS X99 Delux Motherboard (x99 > chipset). > This site https://www.asus.com/us/Motherboards/X99DELUXE/specifications/ > tells that > "Quad Channel Memory Architecture " > which means that "-n 4" is the correct configuration for me. > > To fully use quad channel memory, I have to use 4 separated DRAM, > installed on different memory slots of my motherboard. > > -n option optimizes memory bank access pattern for datastructures. > Since most motherboards support dual or quad memory channel, > -n 4 will work for most systems. (Only few motherboards support > tri-channel memory) > > I hope that this information is useful to you. > Keunhong. > > > > 2015-06-28 18:54 GMT+09:00 Abhishek Verma <abhishekv.verma at gmail.com>: > >> Hi, >> >> I am new to DPDK and i tried searching the archives in case this had been >> discussed but couldnt find any references and hence this email: >> >> What is the significance of " -n NUM: Number of memory channels per >> processor socket" which is passed as an EAL option? I have a virtual >> machine (VM) spawned using VirtualBox and i am trying to use DPDK to get >> faster access to packets there. I did lscpu, but that didnt give me >> anything interesting that i could use here: >> >> abhishekV at VirtualBox:~/dpdk/dpdk-2.0.0/x86_64-native-linuxapp-gcc/app$ >> sudo >> lscpu >> [sudo] password for abhishekV: >> >> Architecture: x86_64 >> CPU op-mode(s): 32-bit, 64-bit >> Byte Order: Little Endian >> CPU(s): 2 >> On-line CPU(s) list: 0,1 >> Thread(s) per core: 1 >> Core(s) per socket: 2 >> Socket(s): 1 >> NUMA node(s): 1 >> Vendor ID: GenuineIntel >> CPU family: 6 >> Model: 58 >> Stepping: 9 >> CPU MHz: 2594.017 >> BogoMIPS: 5188.03 >> L1d cache: 32K >> L1d cache: 32K >> L2d cache: 6144K >> NUMA node0 CPU(s): 0,1 >> abhishekV at VirtualBox:~/dpdk/dpdk-2.0.0/x86_64-native-linuxapp-gcc/app$ >> >> I understand that i have two cores and hence should use -c 1 (since i have >> cores 0 and 1). However, i dont understand what to give as the "-n" >> option. >> Is it always 4? >> >> Thanks, Abhishek >> > >
