[dpdk-dev] why all the other threads except lcore-slave pinned to master lcore?

[Kevin Traynor]

On 10/24/2016 12:10 PM, ychen wrote:
> Hi, I am a freshman learning DPDK, when I followed the document INSTALL.DPDK.md to launch openvswitch with dpdk inited, I found that all the threads are pinned to master lcore except lcore-slave and vfio-sync, but I can not find any code to set the affinity for these threads. 
> Here is my question:
> 1. why vfio-sync is pinned to a core which is not included in the slave lcore nor master lcore?
> 2. why all other threads pinned to master lcore? is anything I am setting wrong?

Hi - these are probably more appropriate for the ovs-dev list. I
answered the post you put over there.

> 
> 
> Here is some logs:
> 2016-10-24T10:42:03Z|00001|vlog|INFO|opened log file /var/log/openvswitch/ovs-vswitchd.log
> 2016-10-24T10:42:03Z|00002|ovs_numa|INFO|Discovered 24 CPU cores on NUMA node 0
> 2016-10-24T10:42:03Z|00003|ovs_numa|INFO|Discovered 24 CPU cores on NUMA node 1
> 2016-10-24T10:42:03Z|00004|ovs_numa|INFO|Discovered 2 NUMA nodes and 48 CPU cores
> 2016-10-24T10:42:03Z|00005|reconnect|INFO|unix:/var/run/openvswitch/db.sock: connecting...
> 2016-10-24T10:42:03Z|00006|reconnect|INFO|unix:/var/run/openvswitch/db.sock: connected
> 2016-10-24T10:42:03Z|00007|dpdk|INFO|DPDK Enabled, initializing
> 2016-10-24T10:42:03Z|00008|dpdk|INFO|No vhost-sock-dir provided - defaulting to /var/run/openvswitch
> 2016-10-24T10:42:03Z|00009|dpdk|INFO|EAL ARGS: ovs-vswitchd -c 0xf --socket-mem 1024,1024
> EAL: Detected 48 lcore(s)
> EAL: Probing VFIO support...
> EAL: VFIO support initialized
> PMD: bnxt_rte_pmd_init() called for (null)
> EAL: PCI device 0000:01:00.0 on NUMA socket 0
> EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
> EAL: PCI device 0000:01:00.1 on NUMA socket 0
> EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
> EAL: PCI device 0000:06:00.0 on NUMA socket 0
> EAL:   probe driver: 8086:1521 rte_igb_pmd
> EAL: PCI device 0000:06:00.1 on NUMA socket 0
> EAL:   probe driver: 8086:1521 rte_igb_pmd
> 2016-10-24T10:42:06Z|00010|dpdk|INFO|DPDK pdump packet capture enable
> 
> 
> and the output of the cpu_layout:
> cores =  [0, 1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13]
> sockets =  [0, 1]
> 
> 
>         Socket 0        Socket 1        
>         --------        --------        
> Core 0  [0, 24]         [1, 25]         
> Core 1  [2, 26]         [3, 27]         
> Core 2  [4, 28]         [5, 29]         
> Core 3  [6, 30]         [7, 31]         
> Core 4  [8, 32]         [9, 33]         
> Core 5  [10, 34]        [11, 35]        
> Core 8  [12, 36]        [13, 37]        
> Core 9  [14, 38]        [15, 39]        
> Core 10 [16, 40]        [17, 41]        
> Core 11 [18, 42]        [19, 43]        
> Core 12 [20, 44]        [21, 45]        
> Core 13 [22, 46]        [23, 47] 
> All the threads and their pinned core for vswitchd:
> 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
>