[ovs-discuss] vhost-user multiqueue PMD RSS

Hui Jing h.jingict at gmail.com
Sun Jun 11 12:04:49 UTC 2017

Hi all,

I am new to OVS-DPDK and trying to figure out the mechanism of vhost-user
multiqueue scenario. I understand that the PMD thread is created for
polling the queues of vhost-user or physical NIC and the affinity bind PMD
to queues. However, the PMD transmission side confused me, I would like to
learn PMD thread mechanism and how it distributes traffic to different

Let's consider this scenario: one PMD thread is responsible for two queues
of one vhost-user, when packet destined to the vhost-user, how it decide
which queue to trasmit? is there equivalence to RSS?
                                          |Rx Queue0|
Traffic ==>PMD thread ==>                      ==>Virtio Frontend in VM

                                          |Rx Queue1|
Thanks in advance
Best Regards,
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