qemu-kvm 服务器上 OpenBSD 客户机 CPU 负载调整技巧

Question 1

我按照以下说明成功降低了 CPU 使用率：https://marc.info/?l=openbsd-misc&m=151575775607633&w=2。下面是我的 OpenBSD 6.4 虚拟机配置文件的示例：

<domain type='kvm'>
  <name>openbsd</name>
  <uuid>6ab7f964-06f2-4526-b5a7-c5cc1ff22254</uuid>
  <metadata>
    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
      <libosinfo:os id="http://openbsd.org/openbsd/6.4"/>
    </libosinfo:libosinfo>
  </metadata>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>524288</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-4.0'>hvm</type>
    <bootmenu enable='yes'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <cpu mode='host-model' check='partial'>
    <model fallback='allow'/>
  </cpu>
  <clock offset='utc'>
    <timer name='hpet' present='yes'/>
    <timer name='hypervclock' present='yes'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>coredump-restart</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native'/>
      <source dev='/dev/lvm2/openbsd-vm'/>
      <target dev='vda' bus='virtio'/>
      <boot order='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='usb' index='0' model='none'/>
    <interface type='bridge'>
      <mac address='fb:70:55:fa:35:08'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>    
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
      <listen type='address' address='127.0.0.1'/>
    </graphics>
    <video>
      <model type='virtio' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>
</domain>

现在主机的 CPU 使用率已经下降到 2-4% 左右。之前是 10-12% 左右。

Answer

我按照以下说明成功降低了 CPU 使用率：https://marc.info/?l=openbsd-misc&m=151575775607633&w=2。下面是我的 OpenBSD 6.4 虚拟机配置文件的示例：

<domain type='kvm'>
  <name>openbsd</name>
  <uuid>6ab7f964-06f2-4526-b5a7-c5cc1ff22254</uuid>
  <metadata>
    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
      <libosinfo:os id="http://openbsd.org/openbsd/6.4"/>
    </libosinfo:libosinfo>
  </metadata>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>524288</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-4.0'>hvm</type>
    <bootmenu enable='yes'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <cpu mode='host-model' check='partial'>
    <model fallback='allow'/>
  </cpu>
  <clock offset='utc'>
    <timer name='hpet' present='yes'/>
    <timer name='hypervclock' present='yes'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>coredump-restart</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native'/>
      <source dev='/dev/lvm2/openbsd-vm'/>
      <target dev='vda' bus='virtio'/>
      <boot order='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='usb' index='0' model='none'/>
    <interface type='bridge'>
      <mac address='fb:70:55:fa:35:08'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>    
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
      <listen type='address' address='127.0.0.1'/>
    </graphics>
    <video>
      <model type='virtio' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>
</domain>

现在主机的 CPU 使用率已经下降到 2-4% 左右。之前是 10-12% 左右。

Question 2

真正有帮助的是：

<controller type='usb' index='0' model='none'/>
<clock offset='utc'>
  <timer name='hpet' present='yes'/>
  <timer name='hypervclock' present='yes'/>
</clock>

将主机系统上的“空闲”负载减少了近 10%（顶部）。谢谢！

Answer

真正有帮助的是：

<controller type='usb' index='0' model='none'/>
<clock offset='utc'>
  <timer name='hpet' present='yes'/>
  <timer name='hypervclock' present='yes'/>
</clock>

将主机系统上的“空闲”负载减少了近 10%（顶部）。谢谢！

Question 3

上述时钟配置和 USB 配置均未改善我的 FreeBSD 13.1 在 AlmaLinux 9.0（内核 5.14.0-70.22.1.el9_0.x86_64 和 qemu-kvm-core-6.2.0-11.el9_0.5.x86_64）上的 CPU 使用率。

我知道这是为了 OpenBSD 而不是 FreeBSD 而设计的，我只是希望这条评论可以为潜在的读者节省一些时间。

Answer

上述时钟配置和 USB 配置均未改善我的 FreeBSD 13.1 在 AlmaLinux 9.0（内核 5.14.0-70.22.1.el9_0.x86_64 和 qemu-kvm-core-6.2.0-11.el9_0.5.x86_64）上的 CPU 使用率。

我知道这是为了 OpenBSD 而不是 FreeBSD 而设计的，我只是希望这条评论可以为潜在的读者节省一些时间。

qemu-kvm 服务器上 OpenBSD 客户机 CPU 负载调整技巧

答案1

答案2

答案3

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