[ovs-build] [ovs-dev] Packet Drop Issue in OVS-DPDK L2FWD Application

Ian Stokes ian.stokes at intel.com
Mon Nov 19 13:35:08 UTC 2018

On 11/18/2018 8:16 PM, vkrishnabhat k wrote:
> Hi Team,
> I am new to OVS and DPDK. While I am using l2fwd application with OVS and
> DPDK I am seeing packet drop issue in OVS bridge.
> Topology : My topology has Ubuntu machine (Ubuntu 18.04 LTS). I have
> installed Qemu-KVM 2.11.1 version. Also I am using OVS-DPDK. Please find
> the detailed topology attached with this mail. I have bound two NICs (Intel
> 82599ES 10-gigabit ) to dpdk IGB_UIO driver and also have added same ports
> in to OVS bridge "br0". I am trying to send the bidirectional traffic from
> both the port and measure the throughput value for the l2fwd application.

> Could you please help me with below questions to understand l2fwd better.

Hi, just a few questions to clarify, I assume you mean you are running 
the DPDK sample app 'l2fwd' in a Virtual machine that is also connected 
to bridge br0 via a vhostuser port?

> What is the reason for packet drops in OVS bridge ?
> What is the expected throughput value for l2fwd ?
> How to improve the performance of l2fwd to get better throughput value ?
> Is it possible to send or can l2fwd handle layer 7 traffic ?
> I tried tuning performance by adding more number of Rx queues and
> increasing the Rx queue size as per the link "
> http://docs.openvswitch.org/en/latest/intro/install/dpdk/", but it didn't
> help much.

Can you provide what versions of OVS and DPDK are being used in the host 
and VM instances?

> I have attached screen shots of the Topology, DPDK port statistics, OVS
> configurations with this mail.

I don't see these attached, they may have been filtered. Could you copy 
the output in these to the mail in text.


> It will be really great if you could help me with this.
> Look forward to hear from you.
> Thanks in advance.
> Regards,
> Venkat
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