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[Qemu-devel] [Bug 654913] Re: Windows XP uses 200% CPU when given 2 VCPU
From: |
.:. brainsik |
Subject: |
[Qemu-devel] [Bug 654913] Re: Windows XP uses 200% CPU when given 2 VCPUs |
Date: |
Tue, 12 Oct 2010 20:52:41 -0000 |
It turns out, that if you use the ACPI Multiprocessor, this problem goes
away. If you use MPS Multiprocessor, then this problem occurs. The worst
part is if you originally built the VM without ACPI, then there is *no
way* to use on the ACPI HALs in Windows XP without reinstalling. There's
a ton of MS knowledge base articles about this.
--
Windows XP uses 200% CPU when given 2 VCPUs
https://bugs.launchpad.net/bugs/654913
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Status in QEMU: New
Bug description:
When using libvirt to give a domain 2 CPUs (<domain
type='kvm'><vcpu>2</vcpu></domain>), the Windows XP kvm process will use 200%
CPU when Windows is idle. Switching the number of CPUs back to 1, the kvm
process gives normal idle percentages.
Using libvirt 0.8.3-1ubuntu9, tried with the following qemu-kvm packages:
qemu-kvm_0.12.4+noroms-0ubuntu7_amd64.deb
qemu-kvm_0.12.5+noroms-0ubuntu4_amd64.deb
The smp flag being set by libvirt is:
-smp 2,sockets=2,cores=1,threads=1
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