[ovs-dev] dpdk startup cannot send/recv packet in first serveral seconds

[wenxu]

Hi all,

I just test ovs-dpdk with restart. I found when the dpdk start the PHYSICAL NIC can't send/recv packet

I have a vhostuserclient port and dpdk port（82599EB） bridge with br0

It spends 1.4s for restarting the ovs-vswitchd.
1.  It sends icmp packet(1 packet/second) from virtual machine to outside the host， there are 7 packets lost.
2.  It sends packet to the br0 there are only 2 packets lost(the restart reason). 

For the first case why are there the other 5 packets? The datapath flow also forward to dpdk port, The dpdk port no dropped counter and have 5 tx counter. 
I debug in the ovs-dpdk , the packet have been sent through port and return zero（with no dropped), It's a problem of dpdk nic-port startup?

Is there some restriction for ovs-dpdk startup to send/recv packet on PHYSICAL NIC immediately?

BR
wenxu