<div dir="ltr">Hi Erico,<div><br></div><div>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.</div><div><br></div><div>You can try to use the RAW Section [1] to pass special attributes to the underlying hypervisor. </div>
<div>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.</div><div><br></div><div>I think the following could work:</div>
<div><br></div><div>RAW = [</div><div> TYPE="kvm",</div><div> 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>"</div>
<div>]</div><div><br></div><div>I don't have a test machine around and I would to hear back from you if it works or not.</div><div><br></div><div>[1]: <a href="http://opennebula.org/documentation:rel4.2:template#raw_section">http://opennebula.org/documentation:rel4.2:template#raw_section</a> </div>
<div>[2]: <a href="http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html">http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html</a></div><div><br></div><div>Health and Goodwill,</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Aug 31, 2013 at 11:01 PM, Erico Augusto Cavalcanti Guedes <span dir="ltr"><<a href="mailto:eacg@cin.ufpe.br" target="_blank">eacg@cin.ufpe.br</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello,<br><br></div><div>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:<br>
/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<br>"<br></div><div>I'll be grateful if you can help me with the following question:<br>
How to customize -device virtio-blk-pci parameter during OpenNebula VM initialization to insert x-data-plane=on on it?<br><br>My VM Template:<br>CONTEXT=[NETWORK="YES",SSH_PUBLIC_KEY="$USER[SSH_PUBLIC_KEY]"]<br>
CPU="1"<br>DISK=[AIO="native",BUS="virtio",CACHE="none",DEV_PREFIX="vd",FORMAT="raw",IMAGE_ID="1"]<br>GRAPHICS=[LISTEN="0.0.0.0",TYPE="VNC"]<br>
MEMORY="256"<br>NIC=[NETWORK_ID="0"]<br>OS=[ARCH="i686",BOOT="hd"]<br><br></div><div>KVM process on node:<br>/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<br>
-uuid c014337c-5255-e983-862e-b744f889aa49 -no-user-config -nodefaults <br>-chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-27.monitor,server,nowait<br>-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown-boot c <br>
-drive file=/srv/cloud/one/var//datastores/0/27/disk.0,if=none,id=drive-virtio-disk0,format=raw,cache=none<br>-device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0<br>-drive file=/srv/cloud/one/var//datastores/0/27/disk.1,if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw<br>
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=22,id=hostnet0<br>-device virtio-net-pci,netdev=hostnet0,id=net0,mac=02:00:c0:a8:0f:6e,bus=pci.0,addr=0x3<br>-usb -vnc <a href="http://0.0.0.0:27" target="_blank">0.0.0.0:27</a> -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5<br>
<br></div><div>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.<br>
<br></div><div>Thanks in advance,<br><br>Erico.<br></div><div><br>[1] <a href="ftp://public.dhe.ibm.com/linux/pdfs/KVM_Virtualized_IO_Performance_Paper_v2.pdf" target="_blank">ftp://public.dhe.ibm.com/linux/pdfs/KVM_Virtualized_IO_Performance_Paper_v2.pdf</a><br>
</div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Valentin Bud<div><a href="http://databus.pro" target="_blank">http://databus.pro</a> | <a href="mailto:valentin@databus.pro" target="_blank">valentin@databus.pro</a></div>
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