Hi,
Recently we're testing qemu-kvm to run a windows guest with database installed.
But kvm can't perform in random disk operations.
We're already using vhost_net, virtio drivers. LVM for guest storage
and virtio-blk-data-plane.
There are anything else that we can do to improve the performance?
We are using HammerDB to run our tests.
Here is the guest config:
<domain type='kvm'>
<name>win2k8r2</name>
<uuid>1dc53ee7-40f6-447b-b2ed-6c3203289616</uuid>
<memory unit='KiB'>25600000</memory>
<currentMemory unit='KiB'>25600000</currentMemory>
<vcpu placement='static'>7</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
</hyperv>
</features>
<cpu mode='host-passthrough'/>
<clock offset='localtime'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
<timer name='hypervclock' present='yes'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source dev='/dev/lvma4/win2k8r2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source dev='/dev/lvma4/win2k8r2-2'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</disk>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source dev='/dev/lvmb1/win2k8r2-1'/>
<target dev='vdc' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<mddress type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:06:64:f9'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'>
<listen type='address'/>
</graphics>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
</devices>
<qemu:commandline>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk2.config-wce=off'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk2.x-data-plane=on'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk1.config-wce=off'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk1.x-data-plane=on'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk0.config-wce=off'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk0.x-data-plane=on'/>
</qemu:commandline>
</domain>aster startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:06:64:f9'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'>
<listen type='address'/>
</graphics>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
</devices>
<qemu:commandline>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk2.config-wce=off'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk2.x-data-plane=on'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk1.config-wce=off'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk1.x-data-plane=on'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk0.config-wce=off'/>
<qemu:arg value='-set'/>
<qemu:arg value='device.virtio-disk0.x-data-plane=on'/>
</qemu:commandline>
</domain>
Thanks!!!
