Public bug reported: Guys,
Soon as we start OpenvSwitch with DPDK inside of a KVM guest, it brings down all the VirtIO NICs! Including non-DPDK NIC VirtIO devices! The problem is easy to reproduce, I'm seeing it on two different hosts, a Dell server and a Macbook Pro, both running Xenial on host and on VM. Also, if DPDK Openvswitch options are enabled on /etc/default/openvswitch, soft reboot stops working! Very weird... Steps to reproduce: 1- At the host, install Ubuntu KVM by running: sudo apt install ubuntu-virt 2- Create two extra Libvirt networks, called "subscriber" and "internet", list this: tmartins@blade:~$ virsh net-list Name State Autostart Persistent ---------------------------------------------------------- default active yes yes internet active yes yes subscriber active yes yes 3- Create a Xenial VM with 3 vNIC (Virtio), wire it against those 3 above netorks. 4- Inside of the Xenial VM, you might see the PCI IDs like this: 00:03.0 Ethernet controller: Red Hat, Inc Virtio network device 00:09.0 Ethernet controller: Red Hat, Inc Virtio network device 00:0a.0 Ethernet controller: Red Hat, Inc Virtio network device 5- Install OpenvSwitch with DPDK: sudo apt install openvswitch-switch-dpdk 6- Configure DPDK: sudo vi /etc/dpdk/dpdk.conf # Enable NR_2M_PAGES=64 7- Select the PCI devices that you want to bind to DPDK drivers: sudo vi /etc/dpdk/interfaces pci 0000:00:09.0 uio_pci_generic pci 0000:00:0a.0 uio_pci_generic 8- Reboot it NOTE: After rebooting it, you'll see by running "dpdk_nic_bind --status", that the latest two VirtIO NIC cards are using DPDK- compatible drivers. So far, so good... 9- Configure OpenvSwitch to use DPDK run: update-alternatives --set ovs-vswitchd /usr/lib/openvswitch-switch-dpdk /ovs-vswitchd-dpdk sudo vi /etc/default/openvswitch-switch Uncomment the latest line, like this: DPDK_OPTS='--dpdk -c 0x1 -n 4' 10- Hit the bug! Run: service openvswitch-switch stop service openvswitch-switch start # BOOM!!! From this point, there are two problems: 1- All VirtIO NIC cards loses connectivity, not only the DPDK ones! But also, vNICs with the regular Linux VirtIO drivers! 2- Soft reboot does not work. That's it! What am I missing here? Workaround: 1- Disable OpenvSwitch DPDK options inside of /etc/default/openvswitch- switch, just comment it, and force-reboot the VM. After this, VM connectivity is restored (on its first vNIC) and soft reboot also works again. I made a video about this! It is on Youtube: https://youtu.be/sSBqYUVsO8U I really appreciate any help! Cheers! Thiago ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: openvswitch-switch-dpdk 2.5.0-0ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6 Uname: Linux 4.4.0-18-generic x86_64 ApportVersion: 2.20.1-0ubuntu1 Architecture: amd64 Date: Sun Apr 10 18:25:34 2016 InstallationDate: Installed on 2016-02-01 (69 days ago) InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160111) SourcePackage: openvswitch UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: openvswitch (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1568627 Title: OpenvSwitch with DPDK brings all VirtIO NICs down, software reboot also doesn't work. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/1568627/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
