[one-users] virtio-blk-data-plane and x-data-plane=on

[Vladislav Gorbunov]

It works with:
DISK     = [ driver = "raw" , cache = "none", io = "native"]
and on RedHat/CentOS kvm only.

2013/9/1 Valentin Bud <valentin.bud at 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
> <eacg at 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
>>
>> _______________________________________________
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>>
>
>
>
> --
> Valentin Bud
> http://databus.pro | valentin at databus.pro
>
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