> On 9 Feb 2018, at 14:04, Gianluca Cecchi <gianluca.cec...@gmail.com> wrote:
> 
> Hello,
> while in my activities to accomplish migration of a Windows 2008 R2 VM (with 
> an Oracle RDBMS inside) from vSphere to oVirt, I'm going to check performance 
> related things.
> 
> Up to now I only ran Windows guests inside my laptops and not inside an oVirt 
> infrastructure.
> 
> Now I successfully migrated this kind of VM to oVirt 4.1.9.
> The guest had an LSI logic sas controller. Inside the oVirt host that I used 
> as proxy (for VMware virt-v2v) I initially didn't have the virtio-win rpm.
> I presume that has been for this reason that the oVirt guest has been 
> configured with IDE disks…

yes
you won’t get any decent performance unless you use virtio drivers. Either 
virtio-block or virtio-scsi

> Can you confirm?
> 
> For this test I started with ide, then added a virtio-scsi disk and then 
> changed also the boot disk to virtio-scsi and all now goes well, with also 
> ovirt-guest-tools-iso-4.1-3 provided iso used to install qxl and so on...
> 
> So far so good.
> I found this bugzilla:
> https://bugzilla.redhat.com/show_bug.cgi?id=1277353 
> <https://bugzilla.redhat.com/show_bug.cgi?id=1277353>
> 
> where it seems that 
> 
> "
> For optimum I/O performance it's critical to make sure that Windows guests 
> use the Hyper-V reference counter feature. QEMU command line should include
> 
> -cpu ...,hv_time
> 
> and
> 
> -no-hpet
> "
> Analyzing my command line I see the "-no-hpet" but I dont see the "hv_time"
> See below full comand.
> Any hints?

What OS type do you have set for that VM? Make sure it matches the Windows 
version. That enables the hyperv enlightenments settings

Thanks,
michal
> Thanks,
> Gianluca
> 
> /usr/libexec/qemu-kvm
> -name guest=testmig,debug-threads=on
> -S
> -object 
> secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-12-testmig/master-key.aes
> -machine pc-i440fx-rhel7.3.0,accel=kvm,usb=off,dump-guest-core=off
> -cpu Westmere,vmx=on
> -m size=4194304k,slots=16,maxmem=16777216k
> -realtime mlock=off
> -smp 2,maxcpus=16,sockets=16,cores=1,threads=1
> -numa node,nodeid=0,cpus=0-1,mem=4096
> -uuid x-y-z-x-y
> -smbios type=1,manufacturer=oVirt,product=oVirt
> Node,version=7-4.1708.el7.centos,serial=xx,uuid=yy
> -no-user-config
> -nodefaults
> -chardev 
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-12-testmig/monitor.sock,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control
> -rtc base=2018-02-09T12:41:41,driftfix=slew
> -global kvm-pit.lost_tick_policy=delay
> -no-hpet
> -no-shutdown
> -boot strict=on
> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
> -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x5
> -device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x4
> -drive if=none,id=drive-ide0-1-0,readonly=on
> -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0
> -drive 
> file=/rhev/data-center/ef17cad6-7724-4cd8-96e3-9af6e529db51/fa33df49-b09d-4f86-9719-ede649542c21/images/2de93ee3-7d6e-4a10-88c4-abc7a11fb687/a9f4e35b-4aa0-45e8-b775-1a046d1851aa,format=qcow2,if=none,id=drive-scsi0-0-0-1,serial=2de93ee3-7d6e-4a10-88c4-abc7a11fb687,cache=none,werror=stop,rerror=stop,aio=native
> -device 
> scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=1,drive=drive-scsi0-0-0-1,id=scsi0-0-0-1,bootindex=1
> -drive 
> file=/rhev/data-center/ef17cad6-7724-4cd8-96e3-9af6e529db51/fa33df49-b09d-4f86-9719-ede649542c21/images/f821da0a-cec7-457c-88a4-f83f33404e65/0d0c4244-f184-4eaa-b5bf-8dc65c7069bb,format=raw,if=none,id=drive-scsi0-0-0-0,serial=f821da0a-cec7-457c-88a4-f83f33404e65,cache=none,werror=stop,rerror=stop,aio=native
> -device 
> scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0
> -netdev tap,fd=30,id=hostnet0
> -device e1000,netdev=hostnet0,id=net0,mac=00:50:56:9d:c9:29,bus=pci.0,addr=0x3
> -chardev 
> socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/421d6f1b-58e3-54a4-802f-fb52f7831369.com.redhat.rhevm.vdsm,server,nowait
> -device 
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm
> -chardev 
> socket,id=charchannel1,path=/var/lib/libvirt/qemu/channels/421d6f1b-58e3-54a4-802f-fb52f7831369.org.qemu.guest_agent.0,server,nowait
> -device 
> virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0
> -chardev spicevmc,id=charchannel2,name=vdagent
> -device 
> virtserialport,bus=virtio-serial0.0,nr=3,chardev=charchannel2,id=channel2,name=com.redhat.spice.0
> -spice 
> tls-port=5900,addr=10.4.192.32,x509-dir=/etc/pki/vdsm/libvirt-spice,tls-channel=default,tls-channel=main,tls-channel=display,tls-channel=inputs,tls-channel=cursor,tls-channel=playback,tls-channel=record,tls-channel=smartcard,tls-channel=usbredir,seamless-migration=on
> -device 
> qxl-vga,id=video0,ram_size=67108864,vram_size=8388608,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pci.0,addr=0x2
> -msg timestamp=on
> 
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