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How VS calculates System CPU Usage?

Source: microsoft.public.virtualserver
Sent: 05/26/2008
From: Filip Barczyk
Message:

Hi,

If you can explain this please help, I'm clueless...

do you know how does VS calculate amount of system CPU resources that is
used by a VM on multicore systems?

The scenario is as follows:

On a single processor dual-core AMD machine (Opteron dual core) there are 2
cores available to the VS to run VMs on. The processor is recognized
correctly as a Dual Core Opteron and both cores show as processors in Device
Manager and Task Manager.

There's one VM defined and running. I gave the VM a whole processor (read
core) - both reserved and max capacity of CPU are set to 100%.

The other core is almost idle, for one thing no VM is running on it.

VS console shows that the VM is using 100% of the system instead of 50% that
I would expect given the VM uses 1 of 2 cores available.

I have no clue why the figures unless the VS is somehow restricted to use
only 1 core for the VMs and it adjusts the usage accordingly. However I was
never presented with such an option during installation and could not find
any setting in the management console.

I'm using MS VS 2005 R2 version "1.1.465.292 EE R2" on a Windows 2003 Server
R2 EE.

Thank you in advance for any help.

Regards,
Filip

Post Reply | This is Spam! | Mark as Spam

Related Messages

RE: How VS calculates System CPU Usage?

Sent: 06/01/2008
From: Tiago Rente
Message:

Hi,

I am not sure that what I will said is 100% correct, but I think this might
be related with a limitation from VS that each VM only uses 1 CPU. Now the
question is to know what is a CPU for the VS when you have multi-core,
hyper-treading (btw, I read the HT should be turned off), etc.

Please see Charlie Russel's reply to the thread "Virtual Server 2005 R2 How
many?...." within this newsgroup.

"Filip Barczyk" wrote:

Show quoted text

> Hi,
>
> If you can explain this please help, I'm clueless...
>
> do you know how does VS calculate amount of system CPU resources that is
> used by a VM on multicore systems?
>
> The scenario is as follows:
>
> On a single processor dual-core AMD machine (Opteron dual core) there are 2
> cores available to the VS to run VMs on. The processor is recognized
> correctly as a Dual Core Opteron and both cores show as processors in Device
> Manager and Task Manager.
>
> There's one VM defined and running. I gave the VM a whole processor (read
> core) - both reserved and max capacity of CPU are set to 100%.
>
> The other core is almost idle, for one thing no VM is running on it.
>
> VS console shows that the VM is using 100% of the system instead of 50% that
> I would expect given the VM uses 1 of 2 cores available.
>
> I have no clue why the figures unless the VS is somehow restricted to use
> only 1 core for the VMs and it adjusts the usage accordingly. However I was
> never presented with such an option during installation and could not find
> any setting in the management console.
>
> I'm using MS VS 2005 R2 version "1.1.465.292 EE R2" on a Windows 2003 Server
> R2 EE.
>
> Thank you in advance for any help.
>
> Regards,
> Filip

RE: How VS calculates System CPU Usage?

Sent: 06/02/2008
From: Filip Barczyk
Message:

Hi Tiago,

I'm aware of the 1 cpu per VM limitation, however that's not it.

I have a very similar environment the only difference being it's 2 single
core Xeons (so the number of available CPUs is the same). On that system with
the same one VM with identical settings, VS shows 50% as system usage.

Thanks anyway.
Greetings,
-Filip

"Tiago Rente" wrote:

Show quoted text

> Hi,
>
> I am not sure that what I will said is 100% correct, but I think this might
> be related with a limitation from VS that each VM only uses 1 CPU. Now the
> question is to know what is a CPU for the VS when you have multi-core,
> hyper-treading (btw, I read the HT should be turned off), etc.
>
> Please see Charlie Russel's reply to the thread "Virtual Server 2005 R2 How
> many?...." within this newsgroup.
>
>
> "Filip Barczyk" wrote:
>
> > Hi,
> >
> > If you can explain this please help, I'm clueless...
> >
> > do you know how does VS calculate amount of system CPU resources that is
> > used by a VM on multicore systems?
> >
> > The scenario is as follows:
> >
> > On a single processor dual-core AMD machine (Opteron dual core) there are 2
> > cores available to the VS to run VMs on. The processor is recognized
> > correctly as a Dual Core Opteron and both cores show as processors in Device
> > Manager and Task Manager.
> >
> > There's one VM defined and running. I gave the VM a whole processor (read
> > core) - both reserved and max capacity of CPU are set to 100%.
> >
> > The other core is almost idle, for one thing no VM is running on it.
> >
> > VS console shows that the VM is using 100% of the system instead of 50% that
> > I would expect given the VM uses 1 of 2 cores available.
> >
> > I have no clue why the figures unless the VS is somehow restricted to use
> > only 1 core for the VMs and it adjusts the usage accordingly. However I was
> > never presented with such an option during installation and could not find
> > any setting in the management console.
> >
> > I'm using MS VS 2005 R2 version "1.1.465.292 EE R2" on a Windows 2003 Server
> > R2 EE.
> >
> > Thank you in advance for any help.
> >
> > Regards,
> > Filip

Post Reply | This is Spam! | Mark as Spam

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