Tried it again,
Important to understand that after modifying and saving configuration of
xml with virsh edit $name_of_guest
when i reenter the xml i can't see the iothread configuration in there.
don't understand why.
Also, after add what you suggested I checked with "info qtree" command on
the guest looking for sign of data-plane is working,
this is the output for info qtree:
dev: virtio-blk-pci, id "virtio-disk1"
class = 0 (0x0)
ioeventfd = true
vectors = 2 (0x2)
virtio-pci-bus-master-bug-migration = false
disable-legacy = false
disable-modern = true
migrate-extra = false
modern-pio-notify = false
x-disable-pcie = false
addr = 07.0
romfile = ""
rombar = 1 (0x1)
multifunction = false
command_serr_enable = true
class SCSI controller, addr 00:07.0, pci id 1af4:1001 (sub
1af4:0002)
bar 0: i/o at 0xc0c0 [0xc0ff]
bar 1: mem at 0xfebf3000 [0xfebf3fff]
bus: virtio-bus
type virtio-pci-bus
dev: virtio-blk-device, id ""
drive = "drive-virtio-disk1"
logical_block_size = 512 (0x200)
physical_block_size = 512 (0x200)
min_io_size = 0 (0x0)
opt_io_size = 0 (0x0)
discard_granularity = 4294967295 (0xffffffff)
cyls = 16383 (0x3fff)
heads = 16 (0x10)
secs = 63 (0x3f)
serial = ""
config-wce = true
scsi = true
request-merging = true
indirect_desc = true
event_idx = true
notify_on_empty = true
any_layout = false
dev: virtio-blk-pci, id "virtio-disk0"
class = 0 (0x0)
ioeventfd = true
vectors = 2 (0x2)
virtio-pci-bus-master-bug-migration = false
disable-legacy = false
disable-modern = true
migrate-extra = false
modern-pio-notify = false
x-disable-pcie = false
addr = 04.0
romfile = ""
rombar = 1 (0x1)
multifunction = false
command_serr_enable = true
class SCSI controller, addr 00:04.0, pci id 1af4:1001 (sub
1af4:0002)
bar 0: i/o at 0xc040 [0xc07f]
bar 1: mem at 0xfebf1000 [0xfebf1fff]
bus: virtio-bus
type virtio-pci-bus
dev: virtio-blk-device, id ""
drive = "drive-virtio-disk0"
logical_block_size = 512 (0x200)
physical_block_size = 512 (0x200)
min_io_size = 0 (0x0)
opt_io_size = 0 (0x0)
discard_granularity = 4294967295 (0xffffffff)
cyls = 16383 (0x3fff)
heads = 16 (0x10)
secs = 63 (0x3f)
serial = ""
config-wce = true
scsi = false
request-merging = true
indirect_desc = true
event_idx = true
notify_on_empty = true
any_layout = false
dev: virtio-scsi-pci, id "scsi1"
ioeventfd = true
vectors = 4 (0x4)
virtio-pci-bus-master-bug-migration = false
disable-legacy = false
disable-modern = true
migrate-extra = false
modern-pio-notify = false
x-disable-pcie = false
addr = 08.0
romfile = ""
rombar = 1 (0x1)
multifunction = false
command_serr_enable = true
class SCSI controller, addr 00:08.0, pci id 1af4:1004 (sub
1af4:0008)
bar 0: i/o at 0xc100 [0xc13f]
bar 1: mem at 0xfebf4000 [0xfebf4fff]
bus: virtio-bus
type virtio-pci-bus
dev: virtio-scsi-device, id ""
num_queues = 1 (0x1)
max_sectors = 65535 (0xffff)
cmd_per_lun = 128 (0x80)
hotplug = true
param_change = true
indirect_desc = true
event_idx = true
notify_on_empty = true
any_layout = true
bus: scsi1.0
type SCSI
dev: scsi-block, id "scsi1-0-0-0"
drive = "drive-scsi1-0-0-0"
channel = 0 (0x0)
scsi-id = 0 (0x0)
lun = 0 (0x0)
Thnaks,
Roy
On Wed, Jan 27, 2016 at 9:03 PM, Roy Shterman <roy.shter...@gmail.com>
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 :
>
> <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>
> <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'/>
> <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
>>
>
>
