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Re: [Qemu-discuss] Any one have successfully make window 7 guest in kvm

From: Scott Zhang
Subject: Re: [Qemu-discuss] Any one have successfully make window 7 guest in kvm use more than 2 cpus/cores?
Date: Thu, 24 Jul 2014 09:45:50 +0800

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?
    Scott Zhang


Jakob Bohm, CIO, Partner, WiseMo A/S.  http://www.wisemo.com
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