I printed cpu layout with cpu_layout.py tool in dpdk tools directory and
lstopo linux command.
They shows the same result that my lcore 0, 2, 4, and 6 are in socket #1.
However, rte_lcore_to_socket_id() returns 0 for lcore 0, 2, 4, and 6.
Why does this difference occur and which value should I use to match lcore
to socket?
(i.e. I'm using dpdk 2.2.0 on Xeon E5520 that is based on nehalem
microarchitecture.)
[mslee at centos7 tools]$ ./cpu_layout.py
============================================================
Core and Socket Information (as reported by '/proc/cpuinfo')
============================================================
cores = [0, 1, 2, 3]
sockets = [1, 0]
Socket 1 Socket 0
-------- --------
Core 0 [0, 8] [1, 9]
Core 1 [2, 10] [3, 11]
Core 2 [4, 12] [5, 13]
Core 3 [6, 14] [7, 15]
code fragment:
socketid = rte_lcore_to_socket_id(lcore_id);
RTE_LOG(INFO, APP, "init_mem: lcore_id = %d, socketid = %d\n",
lcore_id, socketid);
log fragment:
APP: init_mem: lcore_id = 0, socketid = 0
APP: init_mem: lcore_id = 2, socketid = 0
APP: init_mem: lcore_id = 4, socketid = 0
APP: init_mem: lcore_id = 6, socketid = 0
--
Moon-Sang Lee, SW Engineer
Email: sang0627 at gmail.com
Wisdom begins in wonder. *Socrates*
