[Qemu-devel] Re: Significant slowdown after qemu-kvm-1.2.0

[jinho hwang]

Hi Paolo,

Thank you for your reply. I tried qemu-1.5.0 with --enable-kvm, but there is still a big difference between qemu-kvm-1.2.0 and qemu-1.5.0. They both use the same command line to create VM. Am I missing something in the command-line?

sudo qemu-system-x86_64 -name vm -m 1g -hda /home/jinho/virt/vms/vm1.img -device e1000,netdev=net0,mac=00:0c:29:f0:bc:33 -netdev tap,id=net0 -vnc :1

Thank you,

Jinho

On Mon, Jul 1, 2013 at 5:54 PM, Paolo Bonzini <address@hidden> wrote:

Il 01/07/2013 23:51, jinho hwang ha scritto:

> Hi Guys,
>
> I am new to kvm development (used to work on Xen). I used qemu-kvm-1.2.0
> first, and then due to pci memory size (x64 bit support), I switched
> from 1.2.0 to qemu-kvm-1.5.0 (same for 1.3.0~).

There is no qemu-kvm 1.5.0.  You are using qemu 1.5.0.

> After that, my VM slows
> down significantly including booting and execution. Also, sometimes
> kernel messages "CPU stuck for x seconds" show in dmesg. I think CPU
> scheduling has been changed or should be set up properly, but I have no
> clue for now. Can anyone help me to figure out this? I really need some
> fast VMs as I used to run with qemu-kvm-1.2.0.
>
> I am currently running ubuntu-12.10_64 in VM, and my configure was
>
> ./configure --prefix=/usr --target-list=x86_64-linux-user,x86_64-softmmu
>
> sudo qemu-system-x86_64 -name vm -m 1g -hda /home/jinho/virt/vms/vm1.img
> -device e1000,netdev=net0,mac=00:0c:29:f0:bc:33 -netdev tap,id=net0 -vnc

> 135.207.127.181:1 <http://135.207.127.181:1>

You are not using kvm.  Add --enable-kvm to the command line.

Paolo