[libvirt-users] win2k8 guest and (strange) number of cpus task manager sees

[lejeczek]

well, I've tried new to guest's config:
     <topology sockets='1' cores='16' threads='1'/>
no change but I have also tried:
     <topology sockets='4' cores='4' threads='1'/>
which gets all sixteen cores to  "Task Manager" performance tab.
This win2008 is also an eval version so maybe why it did that.

I wonder if tampering with socket/cores/threads has any 
impact on guest performance?
thanks.


On 18/09/14 14:59, Brian Rak wrote:
> Windows has limits on the number of CPUs it can use based 
> on the license level you have (Standard, Enterprise, 
> etc).  You need to present the CPUs as two physical CPUs 
> with multiple cores to get around this.
>
> On 9/18/2014 5:14 AM, lejeczek wrote:
>> hi everybody
>>
>> a qemu-kvm guest gets 16 cpus and Windows in "Device 
>> Manager" sees all sixteeen
>> but "Task Manager" shows only 4, the same "System" 
>> properties say "(4 processors)"
>>
>> I'd like to learn a bit about this - is it some sort of 
>> "resources management" on the libvirt/qemu causing this? 
>> And what does it do to a guest performance-wise side?
>>
>> it's on Scientific L 7,
>> qemu-kvm-1.5.3-60.el7_0.7.x86_64
>> libvirt-1.1.1-29.el7_0.1.x86_64
>>
>> regards
>> P.
>>
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>
>