Hi I haven't tried this myself either, but if there is such an improvement we could add a hint at the KVM driver documentation.
I've a concern about the first sentence of the post: "Data plane is suitable for LVM or raw image file configurations where live migration and advanced block features are not needed." So, are we missing then live-migration? have you tried it? On Thu, Sep 5, 2013 at 12:02 PM, Vladislav Gorbunov <vadi...@gmail.com>wrote: > It works with: > DISK = [ driver = "raw" , cache = "none", io = "native"] > and on RedHat/CentOS kvm only. > > 2013/9/1 Valentin Bud <valentin....@gmail.com>: > > 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 > > <e...@cin.ufpe.br> 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 > >> Users@lists.opennebula.org > >> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org > >> > > > > > > > > -- > > Valentin Bud > > http://databus.pro | valen...@databus.pro > > > > _______________________________________________ > > Users mailing list > > Users@lists.opennebula.org > > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org > > > _______________________________________________ > Users mailing list > Users@lists.opennebula.org > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org > -- -- Join us at OpenNebulaConf2013 in Berlin, 24-26 September, 2013 -- Ruben S. Montero, PhD Project co-Lead and Chief Architect OpenNebula - The Open Source Solution for Data Center Virtualization www.OpenNebula.org | rsmont...@opennebula.org | @OpenNebula
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