Not getting full bandwidth VXLAN + DVR

Hello, In our OpenStack environment(Newton) we are using 10G network in all our nodes. We are using OVS bridging with VXLAN tunneling and DVR. We also enabled Jumbo frames in NIC and also in physical switches. We also enabled VXLAN offloading in our NIC. irqbalance is running which suppose to distribute the network irqs to all cores of the CPU. But unfortunately we are only getting below 1G bandwidth when communicate with our VM's with floating IP's from compute hosts. We tested it using iperf and results are like Host to VM using floating IP - less than 1Gbits/sec VM to VM using internal IP - ~2.5Gbits/sec Any idea or solutions to solve this issue is much appreciated. -- With kind regards, Yedhu Sastri