[dpdk-users] [dpdk-dev] seg fault in InterVM communication using virtio

ppnaik ppnaik at cse.iitb.ac.in
Thu Mar 2 12:13:19 CET 2017


We have some doubt regarding virtio front end. As we are running dpdk 
application inside VM with virtio setup, do we need to use virtio 
specific functions like virtio_recv_pkts() and virtio_xmit_pkts() to 
receive and transmit packets, functions for port initialization like 
virtio_dev_queue_setup()? If yes, we are unable to find any application 
which uses these functions. Can you provide us some pointers on examples 
which uses these functions.


On 2017-02-23 11:57, Yuanhan Liu wrote:
> On Wed, Feb 22, 2017 at 02:25:29PM +0530, mitali wrote:
>> Hi Yuanhan,
>> We are using virt-manager to start the VMs. We are attaching the 
>> image which
>> shows the vNIC setup for the VMs.
>> We have written our own dpdk application to send and receive UDP 
>> packets. The
>> command we are using is
>> ./build/app/dpdkapi -c 1 -- -p 1 where dpdkapi is our application.
>> Inside the application we are sending and receiving packets from 
>> vNIC using
>> rte_eth_tx_burst() and rte_eth_rx_burst().
>> At the sender side after 127 packets the application stops and we 
>> observe a seg
>> fault in dmesg. Using the print statements we observed that it 
>> faults in
>> rte_eth_tx_burst(). All the 127 were received at the receiving VM.
> Would you recompile dpdk with debug info enaled, which could be done 
> by:
> 	make ... EXTRA_CFLAGS='-g3 -O0'
> And run it with gdb then dump the call stack?
> 	--yliu

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