配置XML

配置NUMA感知时可以指定虚拟NUMA节点（vNode）的内存在Host上的分配位置，实现内存的分块绑定，同时配合vCPU绑定，使vNode上的vCPU和内存在同一个物理NUMA node上。下面给出虚拟机XML参考配置。

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  <memory unit='KiB'>8388608</memory>
  <currentMemory unit='KiB'>8388608</currentMemory>
  <vcpu placement='static'>16</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='24'/>
    <vcpupin vcpu='1' cpuset='25'/>
    <vcpupin vcpu='2' cpuset='26'/>
    <vcpupin vcpu='3' cpuset='27'/>
    <vcpupin vcpu='4' cpuset='28'/>
    <vcpupin vcpu='5' cpuset='29'/>
    <vcpupin vcpu='6' cpuset='30'/>
    <vcpupin vcpu='7' cpuset='31'/>
    <vcpupin vcpu='8' cpuset='32'/>
    <vcpupin vcpu='9' cpuset='33'/>
    <vcpupin vcpu='10' cpuset='34'/>
    <vcpupin vcpu='11' cpuset='35'/>
    <vcpupin vcpu='12' cpuset='36'/>
    <vcpupin vcpu='13' cpuset='37'/>
    <vcpupin vcpu='14' cpuset='38'/>
    <vcpupin vcpu='15' cpuset='39'/>
    <emulatorpin cpuset='24-39'/>
  </cputune>
  <numatune>
    <memnode cellid='0' mode='strict' nodeset='0'/>
    <memnode cellid='1' mode='strict' nodeset='1'/>
  </numatune>
  <cpu mode='host-passthrough' check='none'>
    <topology sockets='1' dies='1' clusters='4' cores='4' threads='1'/>
    <numa>
      <cell id='0' cpus='0-7' memory='4194304' unit='KiB'/>
      <cell id='1' cpus='8-15' memory='4194304' unit='KiB'/>
    </numa>
  </cpu>

配置步骤说明：

1. 设置vCPU与物理机CPU一一对应，即1:1绑核。
   如下配置将虚拟机内存设置为8G，vcpu数量设置为16，并将vcpu0-15与对应的宿主机CPU24-39绑定。

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   <memory unit='KiB'>8388608</memory> <currentMemory unit='KiB'>8388608</currentMemory> <vcpu placement='static'>16</vcpu> <cputune> <vcpupin vcpu='0' cpuset='24'/> <vcpupin vcpu='1' cpuset='25'/> <vcpupin vcpu='2' cpuset='26'/> <vcpupin vcpu='3' cpuset='27'/> <vcpupin vcpu='4' cpuset='28'/> <vcpupin vcpu='5' cpuset='29'/> <vcpupin vcpu='6' cpuset='30'/> <vcpupin vcpu='7' cpuset='31'/> <vcpupin vcpu='8' cpuset='32'/> <vcpupin vcpu='9' cpuset='33'/> <vcpupin vcpu='10' cpuset='34'/> <vcpupin vcpu='11' cpuset='35'/> <vcpupin vcpu='12' cpuset='36'/> <vcpupin vcpu='13' cpuset='37'/> <vcpupin vcpu='14' cpuset='38'/> <vcpupin vcpu='15' cpuset='39'/> <emulatorpin cpuset='24-39'/> </cputune>

2. 配置虚拟机NUMA。
   为虚拟机配置两个NUMA节点，分别为node0和node1。

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   <numatune> <memnode cellid='0' mode='strict' nodeset='0'/> <memnode cellid='1' mode='strict' nodeset='1'/> </numatune>

3. 配置NUMA内部结构。
   将两个NUMA节点内存均设置为4G，且node0包含cpu0-7，node1包含cpu8-15。

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   <cpu mode='host-passthrough' check='none'> <topology sockets='1' dies='1' clusters='4' cores='4' threads='1'/> <numa> <cell id='0' cpus='0-7' memory='4194304' unit='KiB'/> <cell id='1' cpus='8-15' memory='4194304' unit='KiB'/> </numa> </cpu>