I am working with DPDK 2.0. I guess it's not DPDK code issue , but more like an environment issue (as same code has been working fine before. It's even working on another setup now). Someone might have accidentally changed my setup, and I want to find out what made dpdk-virtio stop working.
Is DPDK-virtio dependent on any specific modules on the hypervisor? or are there any configurations on the hypervisor that would impact the functionality of virtio? or anything else I need to look into and check? My VM is running on Ubuntu KVM. On Mon, Feb 22, 2016 at 7:50 PM, Yuanhan Liu <yuanhan.liu at linux.intel.com> wrote: > On Mon, Feb 22, 2016 at 11:15:57AM -0800, Clarylin L wrote: > > I am running DPDK application (testpmd) within a VM based on virtio. With > > the same hypervisor and same DPDK code, it used to work well. But it > > stopped working since last week. The VM's port could not receive > anything. > > I ran tcpdump on host's physical port, bridge interface as well as vnet > > interface, and did see packets coming in. However on VM's port there was > > nothing. > > > > I ran gdb trying to debug, it hit function virtio_recv_mergeable_pkts(), > > but nb_used=VIRTQUEUE_NUSED(rxvq) always gave 0. I guess it's because the > > queue was empty. > > > > I enabled the PMD debug logging and the only thing that might be an issue > > was the following part. Other than this I could not see any thing that > > could indicate potential issues. > > > > Thu Feb 18 19:20:10 2016^@PMD: get_uio_dev(): Could not find uio resource > > Thu Feb 18 19:20:10 2016^@PMD: virtio_resource_init_by_ioports(): PCI > Port > > IO found start=0xc040 with size=0x40 > > That could be normal, when you don't bind the driver to igb_uio. > > > If someone can give any pointers that I should further look into, that'd > be > > very helpful. Appreciate your help! > > What's the last commit you are testing? And what are the steps > to reproduce it? I have a quick try with vhost-switch example, > with pkts injected by IXIA; it works fine here. > > Or better, mind do a git bisect? There aren't too many commits > there. It should be a pretty fast bisect. > > --yliu >
