kvm - max memory usage on the host for given configuration of a VM

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Hello!

I do have a question regarding the following VM (running on a linux
3.1.10 host with kvm 1.0). In the VM runs openSUSE 12.1 / 64bit.

The defined vnc interface is not used!

How much memory should this VM maximally use on the host (-> memory
usage of the kvm-qemu process), as long as the currentMemory isn't changed?

I would have expected, that it shouldn't be much more than 256MB, maybe
max. 300MB.

Is this correct?


Thank you for your hint,
kind regards,
Andreas




<domain type='kvm'>
  <name>Dhcp</name>
  <uuid>........</uuid>

  <memory>1048576</memory>
  <currentMemory>262144</currentMemory>

  <vcpu>1</vcpu>

  <os>
    <type arch='x86_64'>hvm</type>
    <boot dev='hd'/>
  </os>

  <features>
    <acpi/>
    <pae/>
  </features>

  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>

  <devices>
    <disk type='file' device='disk'>
      <source file='/raid/dhcp/vm/dhcp.qed' type='aio'/>
      <target dev='vda' bus='virtio'/>
      <driver name='qemu' type='qed' cache='none'/>
    </disk>

    <interface type='ethernet'>
      <mac address='17:a4:10:49:72:a5'/>
      <script path='no'/>
      <target dev='tap6'/>
      <model type='virtio'/>
    </interface>

    <interface type='ethernet'>
      <mac address='58:ac:12:8c:54:ef'/>
      <script path='no'/>
      <target dev='tap4'/>
      <model type='virtio'/>
    </interface>

    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5933' autoport='no'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
  </devices>
</domain>
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