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Re: [libvirt-users] Sluggish performance with virtio and Win10



On Thu, Feb 18, 2016 at 08:49:38AM +0100, John Obaterspok wrote:
Hello,

I'm using virt-manager on my F23 box to run a Windows 10 image but the
performance is so bad it's killing me.

I have "vmx" flag in /proc/cpuinfo

# lsmod |grep kvm
kvm_intel             167936  6
kvm                   503808  1 kvm_intel

virtio-win-0.1.112-1.noarch

But no virtio modules loaded. Should they be loaded nowadays?

Not on the host AFAIK.

The disk format used is vmdk with no caching and native mode.
The io is 100% in windows task manager performing less than 1MB/s

Any clues?


What are the figures from the host?  What is qemu doing and what are the
other processes and devices doing?





/usr/bin/qemu-system-x86_64 -machine accel=kvm -name win10-box -S -machine
pc-i440fx-2.4,accel=kvm,usb=off,vmport=off -cpu
SandyBridge,+osxsave,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff,kvm=off
-m 4096 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid
d4a67adb-5d30-42f8-b8c6-d3c4598700f2 -no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/win10-box.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc
base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=discard
-no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global
PIIX4_PM.disable_s4=1 -boot strict=on -device
ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x6.0x7 -device
ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x6
-device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x6.0x1
-device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2
-device ahci,id=sata0,bus=pci.0,addr=0x8 -device
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive
file=/usr/share/virtio-win/virtio-win.iso,if=none,id=drive-ide0-0-0,readonly=on,format=raw
-device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive
if=none,id=drive-ide0-0-1,readonly=on,format=raw -device
ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -drive
file=/vm/storage/win10-box.img,if=none,id=drive-virtio-disk0,format=vmdk,cache=none,aio=native
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0xa,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-netdev tap,fd=27,id=hostnet0,vhost=on,vhostfd=28 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:cc:f0:31,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0
-spice port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on
-device VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x2 -device
intel-hda,id=sound0,bus=pci.0,addr=0x4 -device
hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -msg timestamp=on

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