[et-mgmt-tools] About CPU Usage of virt-manager

[Masayuki Sunou]

Hi, Dan

> Perhaps we need to support both..
> 
Well, I think so. 

I consider this correction again because I think that priority is low. 

Thanks,
Masayuki Sunou.

--------------------------------------------------------------------
> On Thu, Feb 22, 2007 at 03:44:12PM +0900, Masayuki Sunou wrote:
> > Hi,
> > 
> > I have a question about CPU Usage of virt-manager.
> > 
> > Virt-manager calculates CPU Usage based on physical CPU.
> > Because of that, when the host has many CPU, guest's CPU Usage is difficult 
> > to know. (SMP etc.)
> > 
> > example:
> >   When the host has 32 CPU, and guest's CPU Usage is 100%, virt-manager
> >   displays CPU Usage as 3%.
> >   --> 100%/32CPU=3%
> > 
> > Therefore, I think that virt-manager should calculate CPU Usage based on
> > virtual CPU.(like "xentop")
> >
> > Because "Xentop" calculates CPU Usage based on virtual CPU, I think that
> > virt-manager should also calculate CPU Usage based on virtual CPU. 
> 
> The reason for calculating usage based on physical CPU is to illustrate
> what % of the  host machine's resources are being used by a particular
> machine. eg it makes is very easy to see that 'Guest X' is taking up 50%
> of the host's compute cycles. Simiarly memory is calculated against
> physical RAM. While calculating CPU usage based on virtual CPUs would 
> make it easier to see how much of its own allocation a guest is using, it
> would be harder to visualize overall host utilization. 
> 
> Perhaps we need to support both..
> 
> Dan.
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