4:01 p.m.
On 12/21/2016 12:11 PM, Weiwei Jia wrote:
Hi,
I cannot add iothreads
(https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation) in
the libvirt xml configuration file. Once I add
"<iothreads>4</iothreads>" and other related config for IOthreads
into
the libvirt xml configuration file with virsh command and save it,
these iothreads related configuration will disappear after I open
libvirt xml configuration file again for double-check.
The current libvirt xml configuration file is like following.
If I try to just cut-n-paste the following xml into a buffer, then run
virsh define kvm1.xml, I get:
error: Failed to define domain from kvm1.xml
error: Cannot check QEMU binary /usr/bin/kvm-spice: No such file or
directory
In order to support iothreads, it requires an "-object iothread"... The
"shortest" command line using qemu-kvm would be "qemu-kvm -object
iothread,id=xxx1", so you could try the same with that
/usr/bin/kvm-spice image and see what you get.
You could try to figure out from the
/var/cach/libvirt/qemu/capabilities/*.xml files whether or not the
"iothread" object exists... I would think though that the reason why
this is failing for you is that the kvm-spice emulator doesn't have the
required capability (I forget if there's a magic incantation to ask the
emulator image what it supports, especially for objects).
John
# virsh dumpxml kvm1
<domain type='kvm'>
<name>kvm1</name>
<uuid>20811918-9057-4496-aa03-0fe9d1bcaf78</uuid>
<memory unit='KiB'>8194304</memory>
<currentMemory unit='KiB'>8194304</currentMemory>
<vcpu placement='static'>6</vcpu>
<cputune>
<vcpupin vcpu='0' cpuset='0'/>
<vcpupin vcpu='1' cpuset='1'/>
<vcpupin vcpu='2' cpuset='2'/>
<vcpupin vcpu='3' cpuset='3'/>
<vcpupin vcpu='4' cpuset='4'/>
<vcpupin vcpu='5' cpuset='5'/>
<emulatorpin cpuset='12-15'/>
</cputune>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-2.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<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='disk'>
<driver name='qemu' type='raw' cache='none'
io='native'/>
<source file='/var/lib/libvirt/images/kvm1.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06'
function='0x0'/>
</disk>
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='1'
target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01'
function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='scsi' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04'
function='0x0'/>
</controller>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01'
function='0x1'/>
</controller>
<interface type='network'>
<mac address='52:54:00:a7:67:eb'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03'
function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</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='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02'
function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x05'
function='0x0'/>
</memballoon>
</devices>
<seclabel type='none'/>
</domain>
I want to config above xml file to be like following but once I save
it, the iothreads related configuration will disappear (like above)
after I re-open the libvirt xml for double-check.
<domain type='kvm' id='1'
xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>kvm1</name>
<memory unit='KiB'>8194304</memory>
<currentMemory unit='KiB'>8194304</currentMemory>
<vcpu placement='static'>6</vcpu>
<iothreads>4</iothreads>
<iothreadids>
<iothread id="2"/>
<iothread id="4"/>
<iothread id="6"/>
<iothread id="8"/>
</iothreadids>
<cputune>
<vcpupin vcpu='0' cpuset='0'/>
<vcpupin vcpu='1' cpuset='1'/>
<vcpupin vcpu='2' cpuset='2'/>
<vcpupin vcpu='3' cpuset='3'/>
<vcpupin vcpu='4' cpuset='4'/>
<vcpupin vcpu='5' cpuset='5'/>
<emulatorpin cpuset="12-15"/>
<iothreadpin iothread="2" cpuset="7"/>
<iothreadpin iothread="4" cpuset="8"/>
<iothreadpin iothread="6" cpuset="9"/>
<iothreadpin iothread="8" cpuset="10"/>
</cputune>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-2.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<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='disk'>
<driver name='qemu' type='raw' cache='none'
io='native' iothread='2-8'/>
<source file='/home/wj47/ssd1/kvm1.img'/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06'
function='0x0'/>
</disk>
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<alias name='ide0-1-0'/>
<address type='drive' controller='0' bus='1'
target='0' unit='0'/>
</disk>
<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>
<controller type='scsi' index='0'>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04'
function='0x0'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01'
function='0x1'/>
</controller>
<interface type='network'>
<source network='default'/>
<target dev='vnet0'/>
<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/11'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/11'>
<source path='/dev/pts/11'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='5900' autoport='yes'
listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='cirrus' 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='none'/>
</domain>
Another concern is like this: can I config 4 dedicated IOthreads for
one drive. Just like above, I want to start 4 IOthreads for
virtio-disk0. If true, is my config like above correct? Thank you.
Best,
Weiwei Jia
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