[ovs-dev] [ovs dpdk] why all the ovs threads pinned to master lcore?

[Kevin Traynor]

On 10/24/2016 11:55 AM, ychen wrote:
> hi, I am a freshman to ovs DPDK, when I tried to launch ovs with dpdk inited, I found that all the ovs threads are pinned to master lcore,
> but I can't find any code for setting the affinity of the specified thread.

On older versions of OVS you you can set the affinity via the -c
0x<mask> vswitchd dpdk cmd line arg. It will use the lsb only. For the
latest versions, you can set this through OVSDB - alternatively you can
not set it and by default the non-pmd threads will float on the cores
that vswitchd runs on.

> Here is my configuration:
> lscpu
> Architecture:          x86_64
> CPU op-mode(s):        32-bit, 64-bit
> Byte Order:            Little Endian
> CPU(s):                48
> On-line CPU(s) list:   0-47
> Thread(s) per core:    2
> Core(s) per socket:    12
> Socket(s):             2
> NUMA node(s):          2
> Vendor ID:             GenuineIntel
> CPU family:            6
> Model:                 63
> Stepping:              2
> CPU MHz:               2599.988
> BogoMIPS:              4600.75
> Virtualization:        VT-x
> L1d cache:             32K
> L1i cache:             32K
> L2 cache:              256K
> L3 cache:              30720K
> NUMA node0 CPU(s):     0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46
> NUMA node1 CPU(s):     1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47
> 
> 
> ovs-vsctl  list open_vswitch
> _uuid               : 61d9066b-178e-4672-b8b3-9dcb5587565d
> bridges             : [cc2605fb-fcbb-4627-8834-080c43534119]
> cur_cfg             : 68
> datapath_types      : [netdev, system]
> db_version          : []
> external_ids        : {}
> iface_types         : [dpdk, dpdkr, dpdkvhostuser, dpdkvhostuserclient, geneve, gre, internal, ipsec_gre, lisp, patch, stt, system, tap, vxlan]
> manager_options     : []
> next_cfg            : 68
> other_config        : {dpdk-init="true", dpdk-lcore-mask="0xf", dpdk-socket-mem="1024,1024", pmd-cpu-mask="f0"}
> ovs_version         : []
> ssl                 : []
> statistics          : {}
> system_type         : []
> system_version      : []
> 
> 
>  ps -To tid,pid,psr,comm -p 28262
>    TID    PID PSR COMMAND
>  28262  28262   0 ovs-vswitchd
>  28263  28262  39 vfio-sync
>  28297  28262   0 eal-intr-thread
>  28298  28262   1 lcore-slave-1
>  28299  28262   2 lcore-slave-2
>  28300  28262   3 lcore-slave-3
>  28301  28262   0 dpdk_watchdog2
>  28302  28262   0 vhost_thread1
>  28303  28262   0 pdump-thread
>  28304  28262   0 ct_clean3
>  28305  28262   0 urcu4
>  28744  28262   0 handler101
>  28745  28262   0 handler100
>  28746  28262   0 handler99
>  28747  28262   0 handler98
>  28748  28262   0 handler95
>  28749  28262   0 handler77
>  28750  28262   0 handler79
>  28751  28262   0 handler80
>  28752  28262   0 handler81
>  28753  28262   0 handler73
>  28756  28262   0 handler92
>  28757  28262   0 handler82
>  28758  28262   0 handler96
>  28759  28262   0 handler71
>  28760  28262   0 handler61
>  28761  28262   0 handler62
>  28762  28262   0 handler83
>  28763  28262   0 handler63
>  28764  28262   0 handler84
>  28765  28262   0 handler93
>  28766  28262   0 handler64
>  28767  28262   0 handler85
>  28768  28262   0 handler74
>  28769  28262   0 handler65
>  28770  28262   0 handler66
>  28771  28262   0 handler78
>  28772  28262   0 handler86
>  28773  28262   0 handler87
>  28774  28262   0 handler97
>  28775  28262   0 handler88
>  28776  28262   0 handler56
>  28777  28262   0 handler76
>  28778  28262   0 handler67
>  28779  28262   0 handler60
>  28780  28262   0 handler68
>  28781  28262   0 revalidator75
>  28782  28262   0 revalidator57
>  28783  28262   0 revalidator89
>  28784  28262   0 revalidator69
>  28785  28262   0 revalidator54
>  28786  28262   0 revalidator90
>  28787  28262   0 revalidator55
>  28788  28262   0 revalidator58
>  28789  28262   0 revalidator59
>  28790  28262   0 revalidator70
>  28791  28262   0 revalidator94
>  28792  28262   0 revalidator91
>  28793  28262   0 revalidator72
>  28827  28262   4 pmd103
>  28829  28262   6 pmd102
> _______________________________________________
> dev mailing list
> dev at openvswitch.org
> http://openvswitch.org/mailman/listinfo/dev
>