Re: seg fault in InterVM communication using virtio

On Mon, Feb 20, 2017 at 04:00:12PM +0530, Priyanka wrote:

Hi All,

We have 2 VM running on qemu-kvm hypervisor. We have provided vNIC to the
VMs using macvtap device and virtio as the device model in bridge mode. We
are running DPDK applications (udp client and server) on the VMs. We observe
that the inter-VM communication is not happening using drivers i.e igb_uio
and uio_pci_generic. We were able to communicate between the VMs properly
using SRIOV. But we were not getting performance as expected so we switched
to virtio. But using virtio the DPDK communication hangs after sending 128
packets. We also observe a seg fault in the dmesg of the VM.

Please provide us some guideline to do the inter-VM communication using
virtio. Are we correct if we are using rte_eth_tx/rx_burst to send and
receive packets from the vNIC.

Would you provide more info, say how do you start the vm, and how do you
run the dpdk apps? Providing all the commands that could reproduce your
issue will be better.

	--yliu