libvirt XML文件启动qemu 使用hugepages vhost总结

重点部分

1、添加hugepages 

  <memory unit='M'>4096</memory>  <currentMemory unit='M'>4096</currentMemory>  <memoryBacking>    <hugepages>      <page size="1" unit="G" nodeset="0"/>    </hugepages>    <source type="file"/>    <access mode="private"/>    <allocation mode="immediate"/>  </memoryBacking>  <cpu mode='host-model'>    <model fallback='allow'/>    <topology sockets='1' cores='4' threads='1'/>    <numa>      <cell id='0' cpus='0-3' memory='4096' unit='M' memAccess='shared'/>    </numa>  </cpu>

2、添加vhost接口，mode有server和client

    <interface type='vhostuser'>      <mac address='fa:16:3e:66:bd:66'/>      <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user1' mode='client' />      <model type='virtio'/>    </interface>    <interface type='vhostuser'>      <mac address='fa:16:3e:66:bd:88'/>      <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user2' mode='client' />      <model type='virtio'/>    </interface>

3、指定qemu启动时hugepage挂载路径

在/etc/libvirt/qemu.conf添加

memory_backing_dir = "/mnt/huge" 

4、完整XML文件

<domain type='kvm' id='93'>  <name>instance-vhost</name>  <uuid>5f98aaaa-0f1c-4660-ac93-c92ea4d46e91</uuid>  <metadata>    <nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0">      <nova:package version="2015.1.0-20161229.el7"/>      <nova:name>VM_1482923074.24</nova:name>      <nova:creationTime>2017-01-03 08:05:04</nova:creationTime>      <nova:flavor name="FLV_1483411170.68">        <nova:memory>8192</nova:memory>        <nova:disk>50</nova:disk>        <nova:swap>0</nova:swap>        <nova:ephemeral>0</nova:ephemeral>        <nova:vcpus>32</nova:vcpus>      </nova:flavor>      <nova:owner>        <nova:user uuid="9a880356a66443049beb632bf6835ed3">jianghui522</nova:user>        <nova:project uuid="d6aa39869a4843b2a70cf7e59b1d1076">jianghui522</nova:project>      </nova:owner>      <nova:root type="image" uuid="ba652e41-47d8-4820-a1b5-7024e70ac67c"/>    </nova:instance>  </metadata>  <memory unit='M'>4096</memory>  <currentMemory unit='M'>4096</currentMemory>  <memoryBacking>    <hugepages>      <page size="1" unit="G" nodeset="0"/>    </hugepages>    <source type="file"/>    <access mode="private"/>    <allocation mode="immediate"/>  </memoryBacking>  <cpu mode='host-model'>    <model fallback='allow'/>    <topology sockets='1' cores='4' threads='1'/>    <numa>      <cell id='0' cpus='0-3' memory='4096' unit='M' memAccess='shared'/>    </numa>  </cpu>  <vcpu placement='static' current='4'>4</vcpu>  <cputune>    <shares>12288</shares>  </cputune>  <resource>    <partition>/machine</partition>  </resource>    <sysinfo type='smbios'>      <system>        <entry name='manufacturer'>Fedora Project</entry>        <entry name='product'>OpenStack Nova</entry>        <entry name='version'>2015.1.0-20161229.el7</entry>        <entry name='serial'>5a8f8f31-db9f-4b84-93bb-6f4837434eb9</entry>        <entry name='uuid'>5f98aaaa-0f1c-4660-ac93-c92ea4d46e91</entry>      </system>    </sysinfo>  <os>    <type arch='x86_64' machine='pc-i440fx-1.6'>hvm</type>    <boot dev='hd'/>    <smbios mode='sysinfo'/>  </os>  <features>    <acpi/>    <apic/>    <hyperv>      <relaxed state='on'/>      <vapic state='on'/>      <spinlocks state='on' retries='8191'/>    </hyperv>  </features>  <clock offset='localtime'>    <timer name='pit' tickpolicy='delay'/>    <timer name='rtc' tickpolicy='catchup'/>    <timer name='hpet' present='no'/>  </clock>  <on_poweroff>destroy</on_poweroff>  <on_reboot>restart</on_reboot>  <on_crash>destroy</on_crash>  <devices>    <emulator>/usr/libexec/qemu-kvm</emulator>    <disk type='file' device='disk'>      <driver name='qemu' type='qcow2'/>      <source file='/home/vm/vm_licko/CENT_7.1_S_64_X_20_X_pktgen.qcow2'/>      <backingStore/>      <target dev='vda' bus='virtio'/>      <serial>cafb3cff-8267-4a13-991b-c92103741992</serial>      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>    </disk>    <controller type='usb' index='0'>      <alias name='usb0'/>      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>    </controller>    <controller type='pci' index='0' model='pci-root'>      <alias name='pci.0'/>    </controller>    <interface type='vhostuser'>      <mac address='fa:16:3e:66:bd:66'/>      <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user1' mode='client' />      <model type='virtio'/>    </interface>    <interface type='vhostuser'>      <mac address='fa:16:3e:66:bd:88'/>      <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user2' mode='client' />      <model type='virtio'/>    </interface>    <serial type='file'>      <source path='/var/lib/nova/instances/5f98aaaa-0f1c-4660-ac93-c92ea4d46e91/console.log'/>      <target port='0'/>      <alias name='serial0'/>    </serial>    <serial type='pty'>      <source path='/dev/pts/1'/>      <target port='1'/>      <alias name='serial1'/>    </serial>        <input type='tablet' bus='usb'>      <alias name='input0'/>    </input>    <input type='mouse' bus='ps2'/>    <input type='keyboard' bus='ps2'/>    <graphics type='vnc' port='5901' autoport='yes' listen='0.0.0.0' keymap='en-us'>      <listen type='address' address='0.0.0.0'/>    </graphics>    <video>      <model type='cirrus' vram='16384' heads='1'/>      <alias name='video0'/>      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>    </video>    <memballoon model='virtio'>      <alias name='balloon0'/>      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>      <stats period='10'/>    </memballoon>  </devices></domain>