Re: [Xen-users] CPU load average above 2 on domU but load average 0 on dom0-XCP 1.6

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

'xl top' (which just execs xentop under the hood) will show you all of
your VCPUs utilisation, from which you can infer something about PCPU
utilisation. I can't think of a tool which just gives you PCPU usage
though.

On Thu, 2012-12-06 at 20:26 +0000, Steven Peckins wrote:
> 'xl top' reveals real-time information about resource utilization.  'xl  
> info' is also useful for gleaning information about the hardware (vs. just  
> Dom0, for instance).
> 
> --steve
> 
> On Thu, 06 Dec 2012 09:23:32 -0500, kevin parker  
> <kevin.parker092@xxxxxxxxx> wrote:
> 
> >  Sorry for making things complicated.. yes i was considering load on
> > physical CPU with load on dom0 VCPU.I thought running top on dom0 reveals
> > overall cpu usage as in case of normal system.I forgot to consider it as
> > another Virtual Machine.If this is correct then is there a way to see the
> > actual cpu utilization.
> >
> > Regards,
> > kev
> >
> > On Thu, Dec 6, 2012 at 6:43 PM, Ian Campbell  
> > <Ian.Campbell@xxxxxxxxxx>wrote:
> >
> >> On Thu, 2012-12-06 at 13:06 +0000, kevin parker wrote:
> >> > Hi Ian,
> >> >          Please correct me if i am wrong.From my
> >> > understanding(Eventhough it seems wrong) All the process in domU polls
> >> > its cpu which is actually virtual and process queue in this virtual
> >> > cpu is processed by the actual CPU in which hypervisor has direct
> >> > access to it.In that case if there are lot of process in the process
> >> > queue of domU waiting to get cpu of domU,then wouldnt that affect
> >> > actual CPU,since it is the actual processor that process the process
> >> > queue of  domU.(Even though It seems wrong).
> >>
> >> Are you perhaps confusing the load on the physical processors with the
> >> load on the dom0 VCPUs? They are separate things, dom0's CPUs are VCPUs
> >> just like a domU's CPUs.
> >>
> >> I'm not sure what you mean by a process in domU polling its CPU. domU
> >> (and dom0) VCPUs are scheduled on PCPUS (physical CPUS).
> >>
> >> Ian.
> >>
> >>
> 
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