It works with: DISK = [ driver = "raw" , cache = "none", io = "native"] and on RedHat/CentOS kvm only.
2013/9/1 Valentin Bud <[email protected]>: > Hi Erico, > > This is the first time I hear about virtio-blk-data-plane. Thank you for the > info, looks like this feature brings notable IO improvements. > > You can try to use the RAW Section [1] to pass special attributes to the > underlying hypervisor. > I have found a blog post [2] in which there is a method to enable > virtio-blk-data-plane using the libvirt XML. The RAW section DATA gets > passed to libvirt in XML format. > > I think the following could work: > > RAW = [ > TYPE="kvm", > DATA="<qemu:commandline><qemu:arg value='-set'/><qemu:arg > value='device.virtio-disk0.scsi=off'/></qemu:commandline><!-- config-wce=off > is not needed in RHEL 6.4 --><qemu:commandline><qemu:arg > value='-set'/><qemu:arg > value='device.virtio-disk0.config-wce=off'/></qemu:commandline><qemu:commandline<qemu:arg > value='-set'/><qemu:arg > value='device.virtio-disk0.x-data-plane=on'></qemu:commandline>" > ] > > I don't have a test machine around and I would to hear back from you if it > works or not. > > [1]: http://opennebula.org/documentation:rel4.2:template#raw_section > [2]: > http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html > > Health and Goodwill, > > > On Sat, Aug 31, 2013 at 11:01 PM, Erico Augusto Cavalcanti Guedes > <[email protected]> wrote: >> >> Hello, >> >> on [1], page 10, section 2.3 - KVM Configuration: "To achieve the best >> possible I/O rates for the KVM guest, the virtio-blk-data-plane feature was >> enabled for each LUN (a disk or partition) that was passed from the host to >> the guest. To enable virtio-blk-data-plane for a LUN being passed to the >> guest, the x-data-plane=on option was added for that LUN in the qemu-kvm >> command line used to set up the guest. For example: >> /usr/libexec/qemu-kvm -drive >> if=none,id=drive0,cache=none,aio=native,format=raw,file=<disk or partition> >> -device virtio-blk-pci,drive=drive0,scsi=off,x-data-plane=on >> " >> I'll be grateful if you can help me with the following question: >> How to customize -device virtio-blk-pci parameter during OpenNebula VM >> initialization to insert x-data-plane=on on it? >> >> My VM Template: >> CONTEXT=[NETWORK="YES",SSH_PUBLIC_KEY="$USER[SSH_PUBLIC_KEY]"] >> CPU="1" >> >> DISK=[AIO="native",BUS="virtio",CACHE="none",DEV_PREFIX="vd",FORMAT="raw",IMAGE_ID="1"] >> GRAPHICS=[LISTEN="0.0.0.0",TYPE="VNC"] >> MEMORY="256" >> NIC=[NETWORK_ID="0"] >> OS=[ARCH="i686",BOOT="hd"] >> >> KVM process on node: >> /usr/bin/kvm -S -M pc-i440fx-1.6 -cpu qemu32 -enable-kvm -m 256 -smp >> 1,sockets=1,cores=1,threads=1 -name one-27 >> -uuid c014337c-5255-e983-862e-b744f889aa49 -no-user-config -nodefaults >> -chardev >> socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-27.monitor,server,nowait >> -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc >> -no-shutdown-boot c >> -drive >> file=/srv/cloud/one/var//datastores/0/27/disk.0,if=none,id=drive-virtio-disk0,format=raw,cache=none >> -device >> virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 >> -drive >> file=/srv/cloud/one/var//datastores/0/27/disk.1,if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw >> -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 >> -netdev tap,fd=22,id=hostnet0 >> -device >> virtio-net-pci,netdev=hostnet0,id=net0,mac=02:00:c0:a8:0f:6e,bus=pci.0,addr=0x3 >> -usb -vnc 0.0.0.0:27 -vga cirrus -device >> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 >> >> I'm running ONE 4.2 on Debian 7.1 x86_64, kernel 3.2.0-4-amd64, with >> customized qemu-1.6(compiled by myself to support virtio-blk-data-plane) to >> enable virtio-blk-data-plane, with Debian 7.1 i386 VMs. >> >> Thanks in advance, >> >> Erico. >> >> [1] >> ftp://public.dhe.ibm.com/linux/pdfs/KVM_Virtualized_IO_Performance_Paper_v2.pdf >> >> _______________________________________________ >> Users mailing list >> [email protected] >> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org >> > > > > -- > Valentin Bud > http://databus.pro | [email protected] > > _______________________________________________ > Users mailing list > [email protected] > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org > _______________________________________________ Users mailing list [email protected] http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
