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 > > -- > libvir-list mailing list > libvir-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/libvir-list > -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
