[ovs-discuss] [bug] ovs dpdk restart will fail the existing vhost user interface on VM

[Daniele Di Proietto]

I'd like to be proven wrong, but I don't think that we can do much about
this from the OVS side, since it's qemu that starts the vhostuser
connection.

On 19/02/2016 02:51, "discuss on behalf of gong_ys2004"
<discuss-bounces at openvswitch.org on behalf of gong_ys2004 at aliyun.com>
wrote:

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>Hi,
>I am configuring dpdk ovs with openstack. The OVS is 2.5.0, dpdk is
>2.2.0, qemu is 2.3.
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>
>with the working vm networking, I mean I can ping from inside the vm to
>outside, I restart the ovs-vswitchd,  then the VM's network cannot ping
>out side. but If I start a new VM, the newly started VM can work.
>
>
>I start ovs like this:
>/usr/sbin/ovs-vswitchd --dpdk -l 3 -n 4 --proc-type primary  --huge-dir
>/dev/hugepages --socket-mem 1024,1024 --
>unix:/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:err -vfile:info
>--mlockall --no-chdir --log-file=/var/log/openvswitch/ovs-vswitchd.log
>--pidfile=/var/run/openvswitch/ovs-vswitchd.pid --detach --monitor
>
>
>the kernel parameters are:
>[root at node-108 ~]# cat /proc/cmdline
>BOOT_IMAGE=/vmlinuz-3.10.0-327.10.1.el7.x86_64
>root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root
>rd.lvm.lv=centos/swap net.ifnames=0 biosdevname=0 default_hugepagesz=1GB
>hugepagesz=1GB hugepages=50 iommu=pt intel_iommu=on rhgb quiet
>
>
>the vm is started like this:
>[root at node-108 ~]# ps -ef | grep kvm
>root       925     2  0 12:10 ?        00:00:00 [kvm-irqfd-clean]
>root     14776     1 12 18:42 ?        00:00:44 /usr/libexec/qemu-kvm
>-name instance-0000001b -S -machine pc-i440fx-rhel7.2.0,accel=kvm,usb=off
>-cpu 
>IvyBridge,+pdpe1gb,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds
>_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds -m 4096 -realtime
>mlock=off -smp 2,sockets=2,cores=1,threads=1 -object
>memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libv
>irt/qemu,share=yes,size=4294967296,host-nodes=0,policy=bind -numa
>node,nodeid=0,cpus=0-1,memdev=ram-node0 -uuid
>844030b7-e995-4b8e-8070-68bbfdfbf09f -smbios type=1,manufacturer=Fedora
>Project,product=OpenStack
>Nova,version=12.0.1-1.el7,serial=e5b50de4-d534-40d5-a433-ae7ad3b936bc,uuid
>=844030b7-e995-4b8e-8070-68bbfdfbf09f,family=Virtual Machine
>-no-user-config -nodefaults -chardev
>socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-instance-0000001b/
>monitor.sock,server,nowait -mon
>chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew
>-global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot
>strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
>file=/var/lib/nova/instances/844030b7-e995-4b8e-8070-68bbfdfbf09f/disk,if=
>none,id=drive-virtio-disk0,format=qcow2,cache=none -device
>virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=vir
>tio-disk0,bootindex=1 -chardev
>socket,id=charnet0,path=/var/run/openvswitch/vhue96df5b4-80 -netdev
>type=vhost-user,id=hostnet0,chardev=charnet0 -device
>virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:0e:fa:82,bus=pci.0,add
>r=0x3 -chardev 
>file,id=charserial0,path=/var/lib/nova/instances/844030b7-e995-4b8e-8070-6
>8bbfdfbf09f/console.log -device isa-serial,chardev=charserial0,id=serial0
>-chardev pty,id=charserial1 -device
>isa-serial,chardev=charserial1,id=serial1 -device usb-tablet,id=input0
>-vnc 0.0.0.0:0 -k en-us -device cirrus-vga,id=video0,bus=pci.0,addr=0x2
>-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg
>timestamp=on
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>Thanks
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>
>yong sheng gong
>