[ovs-discuss] OVS-dpdk Packet Error for rate beyond 1MPPS

haris tanvir haristanvir at hotmail.com
Sun Nov 29 12:59:56 UTC 2015


Hi,I have configured OVS on a host with dpdk. I have created a net-dev type bridge and assigned one physical port and one vhost user ports to it.Then, I have created a VM using libvirt and assigned vhost user port to the VM. I am running dpdk L2 Forward Application inside VM (using dpdk poll mode driver).
I have another machine which as has Packet-gen dpdk running on a host. 
When I send Traffic from Virtual Machine to the VM through dpdk at rate 1Million packet per second(64byte packet), L2 forward in the VM just works fine with zero drop rate. However, when I go beyond 1Million Packet per second from packet gen, i see packet errors in OVS physical ports, and as a result any additional packets above 1MPPS does not reach VM. Please do let me know why I am facing this issue.
OVS OUTPUT:ovs-ofctl dump-ports br0OFPST_PORT reply (xid=0x2): 3 ports  port LOCAL: rx pkts=0, bytes=0, drop=0, errs=0, frame=0, over=0, crc=0           tx pkts=292126777, bytes=17527676820, drop=0, errs=0, coll=0  port  1: rx pkts=4917972248, bytes=333253670655, drop=0, errs=7153546496, frame=0, over=0, crc=0           tx pkts=4917673320, bytes=333233296044, drop=0, errs=0, coll=0  port  2: rx pkts=4917673320, bytes=?, drop=?, errs=?, frame=?, over=?, crc=?           tx pkts=4917967282, bytes=?, drop=287, errs=?, coll=?

LIBVIRT TAG to create VM: <interface type='vhostuser'>      <mac address='52:54:00:3b:83:1a'/>      <source type='unix' path='/usr/local/var/run/openvswitch/dpdkvhost0' mode='client'/>      <model type='virtio'/>      <driver>        <host csum='off' gso='off' tso4='off' tso6='off' ecn='off' ufo='off'/>        <guest csum='off' tso4='off' tso6='off' ecn='off' ufo='off'/>      </driver>      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>    </interface>
OVS performance parameters:coremask = 0x100  (2 sibling cores) for the OVS on hostHugepage=1024Kb for OVS in hostcoremask =0x3(1 logical core) for Dpdk L2 Fwd in guest
RegardsHaris Tanvir 		 	   		  
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