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Re: [Qemu-discuss] High CPU in idle Windows guest

From: Terry Glanfield
Subject: Re: [Qemu-discuss] High CPU in idle Windows guest
Date: Sun, 10 May 2015 16:14:43 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (berkeley-unix)

Hi Dave,

You do know that I'm running a Xen hypervisor and not KVM?

I'm not wedded to Xen and would consider using KVM if it's more likely
to solve my problem, but it would be good to get the Xen solution
working properly.


Dave Gosselin <address@hidden> writes:
> Hi Terry,
> It appears that the kernel driver hasn't been started.  You can do
> this manually, before starting qemu, by running this as the root user:
> modprobe kvm
> You can confirm that the modprobe command started via the lsmod
> command:  lsmod | grep -i kvm
> If you see any entries, it's loaded; if the command returns with
> nothing, then it did not load.
> Afterwards, you can run qemu but you may have to run it as root for it
> to take advantage of the KVM module you just started.
> Dave
> On 5/9/15 8:44 PM, Terry Glanfield wrote:
>> Hi Dave,
>> With -enable-kvm I get.
>> Could not access KVM kernel module: No such file or directory
>> failed to initialize KVM: No such file or directory
>> Where to next?  I'm willing to help diagnose it in whatever way I can.
>> Regards,
>> Terry.
>> Dave Gosselin <address@hidden> writes:
>>> Try supplying the -enable-kvm option to your qemu arguments. If it
>>> doesn't work then the support may not be compiled in to qemu or the
>>> driver may not be loaded into the kernel. Let me know.
>>> Dave Gosselin
>>> Sent from my iPhone
>>>> On May 9, 2015, at 18:52, Terry Glanfield <address@hidden> wrote:
>>>> Hi,
>>>> I'm running a freshly installed Windows 7 domU on an up-to-date Debian
>>>> jessie machine running Xen 4.4.1-9. When the Windows machine is idle,
>>>> I'm seeing upwards of 10% CPU usage from the qemu-system-i386 instance.
>>>> Other Linux and FreeBSD machines register negligable CPU usage (<0.5%).
>>>> The server is an HP Proliant DL360 G7.
>>>> PV drivers don't seem to make any difference.
>>>> Data from perf attacthed to the process might give the best clues.
>>>> Any information as to why this processes is comsuming so much CPU would
>>>> be much appreciated.
>>>> Regards,
>>>> Terry.

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