On Wed, 01/27 21:03, Roy Shterman wrote:
> Hi,
>
> First of all thank very much for your help,
>
> Second, unfortunately data-plane didn't worked well, I tried to add threads
> from the instructions you gave me.
>
> Here is my full xml file, maybe you can help me to understand why it didn't
> worked :
Did you specify iothread in the xml?
>
> <domain type='kvm'>
> <name>gen-r-vrt-105-007-RH7.0x64</name>
> <uuid>8f79e97e-d452-4577-82bd-2ed903773026</uuid>
> <memory unit='KiB'>2097152</memory>
> <currentMemory unit='KiB'>2097152</currentMemory>
> <memtune>
> <hard_limit unit='KiB'>8388608</hard_limit>
> </memtune>
> <memoryBacking>
> <locked/>
> </memoryBacking>
> <vcpu placement='static'>2</vcpu>
> <os>
> <type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type>
> <boot dev='hd'/>
> </os>
> <features>
> <acpi/>
> <apic/>
> <pae/>
> </features>
> <clock offset='utc'/>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>restart</on_crash>
Add
<iothreads>1</iothreads>
> <devices>
>
> <emulator>/.autodirect/mtrswgwork/roysh/git/qemu/x86_64-softmmu/qemu-system-x86_64</emulator>
> <disk type='file' device='disk'>
> <driver name='qemu' type='qcow2' cache='none'/>
and change these lines to:
<driver name='qemu' type='qcow2' cache='none' iothread='1'/>
Fam
> <source file='/images/gen-r-vrt-105-007/gen-r-vrt-105-007.img'/>
> <target dev='vda' bus='virtio'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
> function='0x0'/>
> </disk>
> <disk type='network' device='lun'>
> <driver name='qemu' type='raw'/>
> <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-3/1/iser'>
> <host name='11.212.32.52' port='3260'/>
> </source>
> <target dev='vdb' bus='virtio'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
> function='0x0'/>
> </disk>
> <disk type='network' device='lun'>
> <driver name='qemu' type='raw'/>
> <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-1/1'>
> <host name='11.212.32.52' port='3260'/>
> </source>
> <target dev='sda' bus='scsi'/>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <disk type='network' device='lun'>
> <driver name='qemu' type='raw'/>
> <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-2/1'>
> <host name='11.212.32.52' port='3260'/>
> </source>
> <target dev='sdb' bus='scsi'/>
> <address type='drive' controller='1' bus='0' target='0' unit='0'/>
> </disk>
> <controller type='scsi' index='0' model='virtio-scsi'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> function='0x0'/>
> </controller>
> <controller type='scsi' index='1' model='virtio-scsi'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08'
> function='0x0'/>
> </controller>
> <controller type='usb' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> function='0x2'/>
> </controller>
> <controller type='pci' index='0' model='pci-root'/>
> <interface type='bridge'>
> <mac address='00:50:56:28:69:07'/>
> <source bridge='br0:'/>
> <model type='e1000'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> </interface>
> <serial type='pty'>
> <target port='0'/>
> </serial>
> <console type='pty'>
> <target type='serial' port='0'/>
> </console>
> <input type='tablet' bus='usb'/>
> <input type='mouse' bus='ps2'/>
> <graphics type='vnc' port='-1' autoport='yes'/>
> <video>
> <model type='cirrus' vram='9216' heads='1'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
> function='0x0'/>
> </video>
> <memballoon model='virtio'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x0'/>
> </memballoon>
> </devices>
> </domain>
>
> BTW, in RH 7.2 data-plane is default if one is choosing to work with virtio?
>
> Thank you very much,
> Roy
>
> On Thu, Jan 21, 2016 at 11:01 AM, Paolo Bonzini <pbonz...@redhat.com> wrote:
>
> >
> >
> > On 20/01/2016 21:12, Roy Shterman wrote:
> > > Hi,
> > >
> > > I have two questions,
> > >
> > > First, I'm developing for Libiscsi and trying to work with virtio-scsi
> > > dataplane or even virtio-blk dataplane and it doesn't works well.
> > >
> > > I'm working with latest qemu and latest Libiscsi in RedHat 7 libvirt
> > > package.
> > >
> > > my iscsi xml part is :
> > >
> > > virtio-blk -
> > >
> > > <disk type='network' device='lun'>
> > > <driver name='qemu' type='raw'/>
> > > <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-3/1'>
> > > <host name='11.212.32.52' port='3260'/>
> > > </source>
> > > <target dev='vdb' bus='virtio'/>
> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
> > > function='0x0'/>
> > > </disk>
> > >
> > > virtio-scsi -
> > >
> > > <disk type='network' device='lun'>
> > > <driver name='qemu' type='raw'/>
> > > <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-1/1>
> > > <host name='11.212.32.52' port='3260'/>
> > > </source>
> > > <target dev='sda' bus='scsi'/>
> > > <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> > > </disk>
> > > <controller type='scsi' index='0' model='virtio-scsi'>
> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> > > function='0x0'/>
> > > </controller>
> >
> > There is now support for dataplane in libvirt. See
> > https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation and
> > then you can add an iothread='NN' (NN is a number) to the <driver
> > name='qemu' type='raw'/> element.
> >
> > > second thing, I'm trying to look for the code where QEMU allocate all
> > > guest memory (2 GB) in my case.
> >
> > Start at memory_allocate_system_memory; ultimately you'll reach
> > qemu_anon_ram_alloc which is basically an mmap.
> >
> > paolo
> >
