[dpdk-users] drops while transmitting to the kni using rte_kni_tx_burst()

[Shirley Avishour]

Hi,
I have an application over dpdk which is consisted of the following threads
each running on a separate core:
1) rx thread which listens on in a poll mode for traffic (listening on an
ixgbe interface).
2) 2 packet processing threads (for load balancing) each listening on a
ring for traffic from rx thread.
3) kni thread (which also runs on a separate core) - used to record the
received traffic using tcpdump on the kernel interface.

the rx thread receives packets, clones them (using indirect buffer) and
transmit a copy to the kni and the other copy is sent to the packet
processing unit (hashing over 2 packet processing threads).
the receive traffic rate is 100Mbps.
When working with single packet processing thread I am able to get all the
100Mbps towards the kni with no drops.
but when I activate my application with 2 packet processing threads I start
facing drops towards the kni.
the way I see it the only difference now is that I have another threads
which handles an mbuf and frees it once processing is completed.
Can anyone assist with this case please?

Thanks!