[libvirt-users] Sluggish performance with virtio and Win10

[Martin Kletzander]

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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