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Re: [Qemu-devel] Significant slowdown after qemu-kvm-1.2.0
From: |
Andreas Färber |
Subject: |
Re: [Qemu-devel] Significant slowdown after qemu-kvm-1.2.0 |
Date: |
Tue, 02 Jul 2013 01:48:17 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 |
Hi,
Am 02.07.2013 00:24, schrieb jinho hwang:
> 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
Yes, you are still missing -enable-kvm on the QEMU command line, or
alternatively the more modern -machine accel=kvm.
Regards,
Andreas
P.S. Please avoid top-posting and HTML on the mailing list.
> On Mon, Jul 1, 2013 at 5:54 PM, Paolo Bonzini <address@hidden
> <mailto: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>
> <http://135.207.127.181:1>
>
> You are not using kvm. Add --enable-kvm to the command line.
>
> Paolo
>
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