[ovirt-users] Info about windows guest performance

[Gianluca Cecchi]

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...
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

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?

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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