[dpdk-dev] NUMA CPU Sockets and DPDK

Prashant Upadhyaya prashant.upadhyaya at aricent.com
Wed Feb 12 12:28:07 CET 2014

Hi guys,

What has been your experience of using DPDK based app's in NUMA mode with multiple sockets where some cores are present on one socket and other cores on some other socket.

I am migrating my application from one intel machine with 8 cores, all in one socket to a 32 core machine where 16 cores are in one socket and 16 other cores in the second socket.
My core 0 does all initialization for mbuf's, nic ports, queues etc. and uses SOCKET_ID_ANY for socket related parameters.

The usecase works, but I think I am running into performance issues on the 32 core machine.
The lscpu output on my 32 core machine shows the following -
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31
I am using core 1 to lift all the data from a single queue of an 82599EB port and I see that the cpu utilization for this core 1 is way too high even for lifting traffic of 1 Gbps with packet size of 650 bytes.

In general, does one need to be careful in working with multiple sockets and so forth, any comments would be helpful.


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