Re: [Qemu-devel] %cpu used by qemu-kvm processes

["Daniel P. Berrange" <berrange@redhat.com>]

On Fri, Feb 19, 2016 at 11:58:38AM +0000, Jean-Pierre Ribeauville wrote:
> Hi,
> 
> My Guest users ask me why  , from Host point of view , there is a big difference interm of CPU % used by qemu-kvmcontrolling processs :
> 
> Result of  "top"  on the host :
> 
> For Windows guests:
> 
> 8680 qemu      20   0 4939588 4.092g   9668 S  12.6  8.7 927:46.78 qemu-kvm
> 47377 qemu      20   0 2903560 2.121g   9676 S  11.6  4.5 587:08.42 qemu-kvm
> 
> For Linux Guests:
> 
> 120443 qemu      20   0 4832180 1.312g   9628 S   1.7  2.8  59:43.79 qemu-kvm
> 43224 qemu      20   0 4825724 2.235g   9664 S   1.0  4.8 105:27.18 qemu-kvm
> 44894 qemu      20   0 4864728 1.450g   9648 S   1.0  3.1  41:30.73 qemu-kvm
> 45000 qemu      20   0 4862676 1.508g   9648 S   0.3  3.2  39:41.45 qemu-kvm
> 
> 
> These guests are just booted , nothing special running on it as shown by "top"  ran on the Linux Guest :
> 
> %Cpu(s):  0.0 us,  0.2 sy,  0.0 ni, 99.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
> 
> Or   on the Windows Guest
> 
> C:\Users\Administrator>wmic cpu get loadpercentage
> LoadPercentage
> 0
> 0
>
> Any idea to help me to answer them ?

At the very least please show the command line arguments used to boot
the windows guests, and the arguments used with the Linux guests. The
choice of hardware config can have a significant impact on performance
of different guests

Regards,
Daniel
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