Re: [Qemu-discuss] Any one have successfully make window 7 guest in kvm use more than 2 cpus/cores?

[Tony Su]

http://social.technet.microsoft.com/Forums/windows/en-US/970c999c-8ffc-4611-968c-7d0ceffbedd4/max-number-of-cpu-cores-that-windows-7-64-bit-will-recognize?forum=w7itprohardware

Depending on your version of Windows 7, your license supports either
one or two CPU and any number of cores.

Tony

On Wed, Jul 23, 2014 at 6:45 PM, Scott Zhang <address@hidden> wrote:
> that is interesting. i use my opensuse 13.1 with i7 4cores.cpu and run win7
> as guest. win7 show 4 cpus correctly. guess the problem with fedora kvm or
> the xeon cpu. will try later to confirm
>
> On Jul 24, 2014 12:35 AM, "Jakob Bohm" <address@hidden> wrote:
>>
>> On 7/23/2014 6:22 PM, Sai Prajeeth wrote:
>>>
>>> Try setting sockets=6,cores=1? I had this issue when running Solaris as
>>> guest. For some reason Solaris never detected any of the cores. It could
>>> only detect the sockets.
>>>
>>>
>> Unlikely to work.  Windows 7 (unlike the more expensive server licenses
>> for the same kernel) enforces a license restriction of max 2 physical
>> CPUs, each with unlimited cores (subject to the kernel design maximum
>> of at least 32).
>>
>> But try looking at the command line of the running qemu process.  Does
>> it actually specify 2 sockets with 4 cores each, or were the settings
>> somehow mistranslated from libvirt XML to qemu command line?
>>
>> Also, if you are using a computer with more than 2 physical sockets,
>> you may want to check if kvm passes through the physical or the command
>> line CPU topology to the guest.
>>
>>> On Wed, Jul 23, 2014 at 9:38 PM, Scott Zhang <address@hidden
>>> <mailto:address@hidden>> wrote:
>>>
>>>     __
>>>     __
>>>     Dear all:
>>>         I have been trying this for whole afternoon and whole night. I
>>>     have installed windows 7 as guest in kvm using virt-manager which
>>>     use qemu. And after I alloc it 6 vcpus, I noticed win7 only see 2
>>>     cpus in task manager. But in device manager, it shows 6 cpus. After
>>>     google a lot, looks many people say they workaround this by setting
>>>     the topology of CPU, which is technical correct.
>>>         But when I try to set sockets=2,cores=4 and several vairable
>>>     pairs. None is working. Win7 only see 2 at most. I am using fedora
>>>     20 with kernel 3.15 and the default qemu.
>>>         Can any one help?
>>>     Thanks
>>>     Regards
>>>     2014-07-24
>>>
>>> ------------------------------------------------------------------------
>>>     Scott Zhang
>>>     __
>>>
>>>
>>
>>
>> Enjoy
>>
>> Jakob
>> --
>> Jakob Bohm, CIO, Partner, WiseMo A/S.  http://www.wisemo.com
>> Transformervej 29, 2730 Herlev, Denmark.  Direct +45 31 13 16 10
>> This public discussion message is non-binding and may contain errors.
>> WiseMo - Remote Service Management for PCs, Phones and Embedded
>>
>