[libvirt-users] Processor usage of qemu process.

[Daniel P. Berrange]

On Fri, Mar 13, 2015 at 10:32:14AM +0100, Dominique Ramaekers wrote:
> Dear Daniel, my XML's:
> 
> Note: It seems I was to quick, the Windows 8.1 isn't fixed...
> 
> Windows Server 2015 R2
> 
> <domain type='kvm' id='146'>
>   <name>CmsrvAPP2</name>
>   <uuid>02c5daef-662a-85ba-7291-485118badc64</uuid>
>   <memory unit='KiB'>3149824</memory>
>   <currentMemory unit='KiB'>3149824</currentMemory>
>   <memoryBacking>
>     <hugepages/>
>   </memoryBacking>
>   <vcpu placement='static'>4</vcpu>
>   <resource>
>     <partition>/machine</partition>
>   </resource>
>   <os>
>     <type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type>
>     <boot dev='hd'/>
>     <boot dev='cdrom'/>
>     <bootmenu enable='yes'/>
>   </os>
>   <features>
>     <acpi/>
>     <apic/>
>     <pae/>
>   </features>
>   <cpu mode='custom' match='exact'>
>     <model fallback='allow'>Westmere</model>
>     <vendor>Intel</vendor>
>     <feature policy='require' name='pbe'/>
>     <feature policy='require' name='rdtscp'/>
>     <feature policy='require' name='est'/>
>     <feature policy='require' name='vmx'/>
>     <feature policy='require' name='ds'/>
>     <feature policy='require' name='smx'/>
>     <feature policy='require' name='ss'/>
>     <feature policy='require' name='vme'/>
>     <feature policy='require' name='dtes64'/>
>     <feature policy='require' name='tm2'/>
>     <feature policy='require' name='ht'/>
>     <feature policy='require' name='dca'/>
>     <feature policy='require' name='pcid'/>
>     <feature policy='require' name='tm'/>
>     <feature policy='require' name='pdcm'/>
>     <feature policy='require' name='pdpe1gb'/>
>     <feature policy='require' name='ds_cpl'/>
>     <feature policy='require' name='pclmuldq'/>
>     <feature policy='require' name='xtpr'/>
>     <feature policy='require' name='acpi'/>
>     <feature policy='require' name='monitor'/>
>   </cpu>
>   <clock offset='localtime'/>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>restart</on_crash>
>   <devices>
>     <emulator>/usr/bin/kvm-spice</emulator>
>     <disk type='file' device='cdrom'>
>       <driver name='qemu' type='raw' cache='none'/>
>       <source file='/var/lib/libvirt/images/poolCmsrvVH2/virtiodrivers.iso'/>
>       <target dev='hda' bus='ide'/>
>       <readonly/>
>       <alias name='ide0-0-0'/>
>       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>     </disk>
>     <disk type='file' device='cdrom'>
>       <driver name='qemu' type='raw' cache='none'/>
>       <source file='/var/lib/libvirt/images/poolCmsrvVH2/WIN2012R2.iso'/>
>       <target dev='hdc' bus='ide'/>
>       <readonly/>
>       <shareable/>
>       <alias name='ide0-1-0'/>
>       <address type='drive' controller='0' bus='1' target='0' unit='0'/>
>     </disk>
>     <disk type='file' device='disk'>
>       <driver name='qemu' type='raw' cache='none'/>
>       <source file='/var/lib/libvirt/images/poolCmsrvVH2/CmsrvAPP2.raw'/>
>       <target dev='vda' bus='virtio'/>
>       <alias name='virtio-disk0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
>     </disk>
>     <controller type='ide' index='0'>
>       <alias name='ide0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
>     </controller>
>     <controller type='usb' index='0'>
>       <alias name='usb0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
>     </controller>
>     <controller type='pci' index='0' model='pci-root'>
>       <alias name='pci.0'/>
>     </controller>
>     <interface type='bridge'>
>       <mac address='52:54:00:d2:40:25'/>
>       <source bridge='br0'/>
>       <target dev='vnet1'/>
>       <model type='virtio'/>
>       <alias name='net0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
>     </interface>
>     <serial type='pty'>
>       <source path='/dev/pts/2'/>
>       <target port='0'/>
>       <alias name='serial0'/>
>     </serial>
>     <console type='pty' tty='/dev/pts/2'>
>       <source path='/dev/pts/2'/>
>       <target type='serial' port='0'/>
>       <alias name='serial0'/>
>     </console>
>     <input type='tablet' bus='usb'>
>       <alias name='input0'/>
>     </input>
>     <input type='mouse' bus='ps2'/>
>     <input type='keyboard' bus='ps2'/>
>     <graphics type='vnc' port='5902' autoport='yes' listen='127.0.0.1'>
>       <listen type='address' address='127.0.0.1'/>
>     </graphics>
>     <sound model='ich6'>
>       <alias name='sound0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
>     </sound>
>     <video>
>       <model type='vmvga' vram='9216' heads='1'/>
>       <alias name='video0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
>     </video>
>     <memballoon model='virtio'>
>       <alias name='balloon0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
>     </memballoon>
>   </devices>
>   <seclabel type='dynamic' model='apparmor' relabel='yes'>
>     <label>libvirt-02c5daef-662a-85ba-7291-485118badc64</label>
>     <imagelabel>libvirt-02c5daef-662a-85ba-7291-485118badc64</imagelabel>
>   </seclabel>
> </domain>

The USB tablet could be a culprint, as could the choice of video mode.

I'd suggest that you want to install the QXL video driver, and setup
SPICE instead of VNC, along with the SPICE guest agent. This gives a
much better performing graphics layer, and better performing mouse.
instead of the USB tablet which is known to have high CPU cost.

Regards,
Daniel
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