Comment 3 for bug 1236809

On Tue, Oct 08, 2013 at 11:51:19AM -0000, chenlidong wrote:
> chenlidong@linux-0rsg:~/develop/qemu> ps -ef | grep qemu
> root 19030 1 14 19:00 ? 00:04:24 /usr/local/bin/qemu-system-x86_64 -name rhel6 -S -M pc-i440fx-1.6 -m 2048 -smp 1,sockets=1,cores=1,threads=1 -uuid 1925a96a-54b9-3c4a-dda0-6b42fdd0af2c -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/rhel6.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/rhel6.img,if=none,id=drive-ide0-0-0,format=raw,cache=directsync -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=2 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev tap,fd=21,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:b3:b8:53,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -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=0x5
>
> i used perf top, the result is below:
> Samples: 57K of event 'cycles', Event count (approx.): 26336443124
> 15.38% perf-22465.map [.] 0x00007f143b99c9c6
> 5.90% qemu-system-x86_64 [.] phys_page_find
> 4.48% qemu-system-x86_64 [.] address_space_translate_internal
> 3.30% qemu-system-x86_64 [.] compute_all_subw
> 3.15% qemu-system-x86_64 [.] check_regs
> 2.56% qemu-system-x86_64 [.] tb_find_fast
> 2.34% qemu-system-x86_64 [.] tb_find_slow

KVM is disabled - you are not using hardware virtualization extensions.
Add -enable-kvm to the command-line or make sure libvirt is using "kvm"
mode.

Stefan