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Date: Mon, 01 Jul 2013 23:54:27 +0200
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Subject: Re: [Qemu-devel] Significant slowdown after qemu-kvm-1.2.0
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To: jinho hwang <hwang.jinho@gmail.com>
Cc: qemu-devel@nongnu.org

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