安装必要依赖
apt-get update
apt-get install -y make
apt-get install -y gcc
apt-get install -y libssl
apt-get install -y libcap-ng0
apt-get install -y libtool
apt-get install -y autoconf
apt-get install -y qemu
apt-get install -y automake pciutils hwloc numactl
apt-get install -y libnuma-dev
apt-get install libpcap0.8-dev
apt-get install openssl
apt-get install -y python-pip
pip install --upgrade pip 如果这一步出现错误“ImportError: cannot import name main”， 修改/usr/bin/pip中最后三句代码为
from pip import __main__
if __name__ == '__main__':
sys.exit(__main__._main())
pip install six
安装编译DPDK
# mkdir -p dpdk
# wget http://fast.dpdk.org/rel/dpdk-17.08.1.tar.xz
# tar xf dpdk-17.08.1.tar.xz
# export DPDK_DIR= $YOUR_FOLDER_THAT_KEEP_DPDK
# export DPDK_TARGET=x86_64-native-linuxapp-gcc
# export DPDK_BUILD=$DPDK_DIR/$DPDK_TARGET
# make install T=$DPDK_TARGET DESTDIR=install
安装，编译运行OVS
# mkdir -p ovs
# git clone https://github.com/openvswitch/ovs.git
# git checkout branch-2.8
#./boot.sh
#./configure --with-dpdk=$DPDK_BUILD
# make -j 10 && make install
# mkdir -p /usr/local/etc/openvswitch
# mkdir -p /usr/local/var/run/openvswitch
# cd $OVS_DIR
# sudo ./ovsdb/ovsdb-tool create /usr/local/etc/openvswitch/conf.db ./vswitchd/vswitch.ovsschema
# sudo ./ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach
# sudo ./utilities/ovs-vsctl --no-wait init
大页
对于64位的应用，在系统支持的情况下推荐使用1G大页内存，对于run time下的1G大页内存分配，内核需要支持continuous memory allocator（CONFIG_CMA）
# cat /proc/cpuinfo | grep pse /*The hugepage sizes that a CPU supports can be determined from the CPU flags on Intel architecture. If pse exists, 2M hugepages are supported; if pdpe1gb exists, 1G hugepages are supported. On IBM Power architecture, the supported hugepage sizes are 16MB and 16GB*/
# mkdir -p /mnt/huge
# mkdir -p /mnt/huge_2mb
# mount -t hugetlbfs none /mnt/huge
# mount -t hugetlbfs none /mnt/huge_2mb -opagesize=2MB
修改/etc/default/grub文件，在里面加入
GRUB_CMDLINE_LINUX_DEFAULT="default_hugepagesz=1G hugepagesz=2M hugepages=1024 iommu=pt intel_iommu=on isolcpus=2-7"
其中hugepages指定系统预留多大内存用作大页使用，hugepagesz指定大页大小，这里我们是2M，可能的话用1G。
isocpus用作CPU隔离，为了说明针对OVS DPDK实验中CPU调优策略，以一个24核使能超线程的CPU系统做示例进行说明。可以看到除了isocpus，还有DPDK特定的CPU核绑定和操作选项。
当前实验用的系统CPU信息如下，将isolcpus配置成为2-7意味着仅将CPU核0，1用作系统调度。
Socket 0: 0 2 4 6
Socket 1: 1 3 5 7
===== CPU Info Summary =====
Logical processors: 8
Physical socket: 2
Siblings in one socket: 4
Cores in one socket: 4
Cores in total: 8
Hyper-Threading: off
配置完后执行：
# update-grub
# reboot
OVS DPDK的其他配置
# dmesg | grep -e DMAR -e IOMMU /*make sure IOMMU supported*/
[ 0.000000] DMAR: IOMMU enabled
[ 3.976840] AMD IOMMUv2 driver by Joerg Roedel
[ 3.976841] AMD IOMMUv2 functionality not available on this system
# modprobe vfio-pci
# chmod a+x /dev/vfio
# chmod 0666 /dev/vfio/*
# modprobe openvswitch
# cd $OVS_DIR
# ./ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
# mount -t hugetlbfs none /mnt/huge
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-hugepage-dir="/mnt/hugepages"
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-socket-mem="4096,0"
core 2用作DPDK非data path的处理
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-lcore-mask="0x4"
core 4，5用作DPDK data path的处理
# ovs-vsctl --no-wait set Open_vSwitch . other_config:pmd-cpu-mask="0x30"
# ./vswitchd/ovs-vswitchd unix:/usr/local/var/run/openvswitch/db.sock --pidfile --detach --log-file=/var/log/openvswitch/ovs-vswitchd.log
创建网桥及端口
# ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev
# ovs-vsctl add-port br0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser /*it will create associated socker under default path/usr/local/var/run/openvswitch/vhost-user1*/
# ovs-vsctl add-port br0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser
# chmod 777/usr/local/var/run/openvswitch/vhost-user*
创建虚机
1. 直接通过命令创建
如果实验用的环境是nest虚拟化（即虚拟化嵌套的情况），确认下hypervisor是否支持KVM
# egrep '^flags.*(vmx|svm)' /proc/cpuinfo
执行如下命令（斜体标识）:
qemu-system-x86_64 -m 4096 -smp 4 -cpu host-hda /home/set/ubuntu-16.04-server-cloudimg-amd64-disk1.img -boot c -enable-kvm -no-reboot -net none -nographic \
-chardev socket,id=char1,path=/usr/local/var/run/openvswitch/vhost-user1 \
-netdev type=vhost-user,id=mynet1,chardev=char1,vhostforce \
-device virtio-net-pci,mac=00:00:00:00:00:11,netdev=mynet1 \
-object memory-backend-file,id=mem,size=4G,mem-path=/mnt/hugepages,share=on
-numa node,memdev=mem -mem-prealloc \
-virtfs local,mount_tag=host0,security_model=none,id=vm1_dev
Explanations for command above:
Block device options:
-fda/-fdb file use 'file' as floppy disk 0/1 image
-hda/-hdb file use 'file' as IDE hard disk 0/1 image
-hdc/-hdd file use 'file' as IDE hard disk 2/3 image
Character device options:
-chardevsocket,id=id,path=path[,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off](unix)
Network options:
-netdevvhost-user,id=str,chardev=dev[,vhostforce=on|off]
configurea vhost-user network, backed by a chardev 'dev'
-device driver[,prop[=value][,...]]
add device(based on driver)
prop=value,... sets driver properties
use'-device help' to print all possible drivers
use'-device driver,help' to print all possible properties
Standard options:
-mem-path FILE provide backing storage for guest RAM
-mem-prealloc preallocate guest memory (use with-mem-path)
如果机器重启，记得重新挂载相应的模块和启动相应的进程
# modprobe vfio-pci
# chmod a+x /dev/vfio
# chmod 0666 /dev/vfio/*
# modprobe openvswitch
# ./ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
# mount -t hugetlbfs none /mnt/huge
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-hugepage-dir="/mnt/hugepages"
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-socket-mem="4096,0"
# ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-lcore-mask="0x4"
# ovs-vsctl --no-wait set Open_vSwitch . other_config:pmd-cpu-mask="0x30"
# ./vswitchd/ovs-vswitchd unix:/usr/local/var/run/openvswitch/db.sock --pidfile --detach --log-file=/var/log/openvswitch/ovs-vswitchd.log
2. 通过XML创建（推荐）
# virsh create testvm1.xml
虚机被拉起后，配置其中一块NIC挂接在virbr0上用作外网访问，另外一块挂接在vhost bridge上用作虚机间互通及流量测试，注意添加对应的默认路由。
auto ens2
iface ens2 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1
auto ens3
iface ens3 inet dhcp
