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

Shankhadeep Shome shank15217 at gmail.com
Sat Sep 7 09:03:10 PDT 2013 

Also there has been some work on vhost-blk as well as vhost-scsi integrated
with LIO so this work seems like more of an offshoot that the general
direction of KVM performance.


On Sat, Sep 7, 2013 at 1:41 AM, Erico Augusto Cavalcanti Guedes <
eacg at cin.ufpe.br> wrote:

> Hi,
>
>
> 2013/9/5 Ruben S. Montero <rsmontero at opennebula.org>
>
> 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?
>>
>
> No, I haven't tried it. Nevertheless, this information refers to qemu-1.4.
> I'm using qemu-1.6, compiled by myself and linked to kvm command(I don't
> install qemu-kvm package on my debian 7.1 node). Maybe look for this
> information on qemu version history can give us some news.
>
>
>>
>>
>> On Thu, Sep 5, 2013 at 12:02 PM, Vladislav Gorbunov <vadikgo at gmail.com>wrote:
>>
>>> It works with:
>>> DISK     = [ driver = "raw" , cache = "none", io = "native"]
>>> and on RedHat/CentOS kvm only.
>>>
>>
> Vladislav, can you please send kvm process line of your node?
>
>
>>
>>> 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.
>>>
>>
> It results on the following kvm process(observe last line):
>
> kvm -S -M pc-i440fx-1.6 -cpu qemu32 -enable-kvm -m 256 -smp
> 1,sockets=1,cores=1,threads=1 -name one-34 -uuid
> 632931d1-6195-4dfc-c01e-9fed9b19dd84 -no-user-config -nodefaults -chardev
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-34.monitor,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
> -boot c
> -drive
> file=/srv/cloud/one/var//datastores/0/34/disk.0,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native
>
> -device
> virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0
> -drive
> file=/srv/cloud/one/var//datastores/0/34/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 0.0.0.0:34 -vga cirrus
> -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
> -set device.virtio-disk0.scsi=off -set device.virtio-disk0.config-wce=off
> -set device.virtio-disk0.x-data-plane=on
>
> The Virtual machine reaches runn status, but invariably, there were
> Boot failed: could not read the boot disk error.
>
> Some possibilities:
> - Error with vd prefix X GRUB configuration?
> - Is it mandotory to use IDE disk on my raw virtual machine image?
>
> I'm looking for a solution for "Boot failed: could not read the boot disk
> error."
> Some idea?
>
> Thanks,
>
> Erico.
>
>
>
>
>
>>  >
>>> > [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
>>> >>
>>> >> _______________________________________________
>>> >> Users mailing list
>>> >> Users at lists.opennebula.org
>>> >> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>> >>
>>> >
>>> >
>>> >
>>> > --
>>> > Valentin Bud
>>> > http://databus.pro | valentin at databus.pro
>>> >
>>> > _______________________________________________
>>> > Users mailing list
>>> > Users at lists.opennebula.org
>>> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>> >
>>> _______________________________________________
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>>>
>>
>>
>>
>> --
>> --
>> 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 | rsmontero at opennebula.org | @OpenNebula
>>
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>>
>
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