红帽全球峰会9.3.5. 使用缓存分配技术提高性能
您可以使用内核在特定 CPU 模型中提供的缓存分配技术(CAT)。这可为 vCPU 线程启用主机 CPU 缓存的一部分，从而提高了实时性能。
有关如何在
cachetune 标签中配置 vCPU 缓存分配的示例，请参阅以下 XML 配置：
<domain>
<cputune>
<cachetune vcpus='0-1'>
<cache id='0' level='3' type='code' size='3' unit='MiB'/>
<cache id='0' level='3' type='data' size='3' unit='MiB'/>
</cachetune>
</cputune>
</domain>
上面的 XML 文件将 vCPU 0 和 1 的线程配置为分配的第一个 L3 缓存(level='3' id='0')中 3 MiB，一次为 L3CODE，一次为 L3DATA。
注意
单个虚拟机可以有多个
<cachetune> 元素。
如需更多信息，请参阅上游
libvirt 文档 中的 cachetune。
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