Troubleshooting KVM Install Windows7 virtual machine CPU only two issues

Problem Description: Virtual machine created with the following command

Virt-install--ram=2048--vcpus=8--os-type windows--os-variant=winvista \

--cdrom/isos/windows_7_chs_sp1_x86.iso--network bridge=br1 \

--disk path=/dev/vg/office-qa-vs-102-85--accelerate \

--vnc--vncport=5910--noautoconsole--name=office-qa-vs-102-85

After creation, it was found that the number of CPUs in Windows7 was only two, and 8 configurations did not take effect at all.

Reason:

1. Windows 7 supports a maximum of two CPU sockets, each of which can have multiple cores within each socket.

2, KVM default per CPU to simulate a socket, you must modify the virtual machine CPU topology, in order to use more than one CPU.

Workaround:

Modify the virtual machine configuration file XML under/etc/libvirtd/qemu, add a socket multiple cores

Add the following:

<cpu>

<topology sockets= ' 2 ' cores= ' 2 ' threads= ' 2 '/>

</cpu>

Idea to modify the number of Vcpus in <vcpu placement= ' static ' >8</vcpu>

Restart the virtual machine after the modification is complete

This article from "Liang Childe" blog, please be sure to keep this source http://iyull.blog.51cto.com/4664834/1864357

Troubleshooting KVM Install Windows7 virtual machine CPU only two issues