[Bug 716528] Re: kvm 100% when performing apparently IO operations

[Andres Rodriguez]

Hi Serge,

I haven't experienced the same behavior as before 100% CPU with latest
qemu-kvm. However, during installation of a natty VM, while doing IO,
the CPU load is still a bit high sometimes ~70-80%. But, overall I can't
seem to reproduce this problem. The kvm command used by libvirt now is:

/usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 512 -smp
2,sockets=2,cores=1,threads=1 -name natty3 -uuid
a1fc02e8-0002-f0fd-f292-a0afa52500b3 -nodefconfig -nodefaults -chardev
socket,id=monitor,path=/var/lib/libvirt/qemu/natty3.monitor,server,nowait
-mon chardev=monitor,mode=readline -rtc base=utc -no-reboot -boot dc
-drive file=/var/lib/libvirt/images/natty3.img,if=none,id=drive-virtio-
disk0,boot=on,format=raw -device virtio-blk-pci,bus=pci.0,addr=0x5,drive
=drive-virtio-disk0,id=virtio-disk0 -drive file=/home/roaksoax/Desktop
/ubuntu_natty-server-i386.iso,if=none,media=cdrom,id=drive-
ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive
=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=43,id=hostnet0 -device
virtio-net-
pci,netdev=hostnet0,id=net0,mac=52:54:00:38:54:4d,bus=pci.0,addr=0x3
-chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -vnc
127.0.0.1:1 -vga cirrus -device AC97,id=sound0,bus=pci.0,addr=0x4
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

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https://bugs.launchpad.net/bugs/716528

Title:
  kvm 100% when performing apparently IO operations