[CentOS-virt] [CentOS] qemu-kvm high cpu usage with idle windows guest
Micky
mickylmartin at gmail.com
Sun Apr 7 15:45:18 UTC 2013
On Sun, Apr 7, 2013 at 8:32 PM, Zoltan Frombach <zoltan at frombach.com> wrote:
> Check out these threads they may help you solve your issue with Windows VMs:
Well I did. Upstream provides rpms till version 0.12.1.x. Even the
RHEV srpm (the one I am using) has the same version. And I don't want
to compile both libvirt and qemu-kvm from source since it is the
production machine.
> http://forum.proxmox.com/threads/5770-Windows-guest-high-context-switch-rate-when-idle
>
> http://serverfault.com/questions/146922/why-is-idle-windows-vm-using-so-much-cpu
>
> On 4/7/2013 5:18 PM, Banyan He wrote:
>> Maybe you can print out what it is doing, then try to figure out if they
>> are doing good. My linux works good, never tried windows.
>>
Did. Nothing abnormal.
A quick perf shows this:
# ........ ........ ..................
..............................................
#
4.96% qemu-kvm [kvm] [k] kvm_arch_vcpu_ioctl_run
4.83% qemu-kvm [kvm_intel] [k] vmx_vcpu_run
4.47% qemu-kvm [kernel.kallsyms] [k] find_busiest_group
3.23% qemu-kvm [kernel.kallsyms] [k] _spin_lock
3.10% qemu-kvm [kernel.kallsyms] [k] native_write_msr_safe
1.24% qemu-kvm [kernel.kallsyms] [k] _spin_lock_irq
1.22% qemu-kvm [kvm] [k] paging64_walk_addr
1.21% qemu-kvm [kvm] [k] x86_decode_insn
1.21% qemu-kvm [kvm_intel] [k] vmcs_writel
>> Banyan He
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