[libvirt-users] Processor usage of qemu process.

[Andrey Korolyov]

On Fri, Mar 13, 2015 at 12:35 PM, Daniel P. Berrange
<berrange at redhat.com> wrote:
> 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

There is none of enlightenment timer features enabled, I`d suggest to
start fixing the issue by adding them in the config. USB tablet is a
great problem too for a generated additional workload in idle, though
usb3 tablet connection results in much lower cpu consumption than
usb2.