cpu模式和拓扑
<domain>
...
<cpu mode='host-model'>
<model fallback='allow'/>
<topology sockets='1' cores='2' threads='1'/>
</cpu>
...
</domain>
cpu mode:可取值为custom host-model host-passthrouth
<domain>
...
<cpu match='exact'>
<model fallback='allow'>core2duo</model>
<vendor>Intel</vendor>
<topology sockets='1' cores='2' threads='1'/>
<cache level='3' mode='emulate'/>
<feature policy='disable' name='lahf_lm'/>
</cpu>
...
</domain>
cpu match:可取值为exact minimum strict
另外cpu的numa配置也在这里配。
vcpu分配
<domain>
...
<vcpu placement='static' cpuset="1-4,^3,6" current="1">2</vcpu>
<vcpus>
<vcpu id='0' enabled='yes' hotpluggable='no' order='1'/>
<vcpu id='1' enabled='no' hotpluggable='yes'/>
</vcpus>
...
</domain>
vcpu:最大vcpu数量,不能超出cpu拓扑中的数值。
cpuset:指定CPU的亲和性,如果cputune中制定了vcpupin的亲和性,这里的将被忽略。
current:开机时给虚拟机分配的cpu数量。
vcpus:配置单个vcpu的状态。
cpu热插
当前配置:
<vcpu placement='static' current='2'>4</vcpu>
<cpu>
<topology sockets='1' cores='4' threads='1'/>
</cpu>
根据上述配置,此虚拟机开机时有两个cpu,另外有两个cpu可以后插入。
libvirt监控状态:
virsh # vcpucount instance-0000000d
maximum config 4
maximum live 4
current config 2
current live 2
virsh # vcpuinfo instance-0000000d
VCPU: 0
CPU: 2
State: running
CPU time: 1.3s
CPU Affinity: yyyy
VCPU: 1
CPU: 3
State: running
CPU time: 0.5s
CPU Affinity: yyyy
virsh # cpu-stats instance-0000000d
CPU0:
cpu_time 0.000000000 seconds
vcpu_time 0.000000000 seconds
CPU1:
cpu_time 0.000000000 seconds
vcpu_time 0.000000000 seconds
CPU2:
cpu_time 1.559106643 seconds
vcpu_time 1.149663485 seconds
CPU3:
cpu_time 1.006847058 seconds
vcpu_time 0.701462772 seconds
Total:
cpu_time 2.565953701 seconds
user_time 0.540000000 seconds
system_time 0.710000000 seconds
虚拟机内部CPU列表:
插入cpu:
# virsh setvcpus instance-0000000d --count 4 --live
在虚拟机内部激活新插入的cpu:
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