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

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Significant slowdown after qemu-kvm-1.2.0
Date: Mon, 01 Jul 2013 23:54:27 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

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
> <>

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


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