[Qemu-devel] Idle win7 guest's cpu consumption is 60%

[楼正伟]

Hi,

    I'm using KVM win7(32bit) guest, and found that, guest cpu was almostly 60% when it's idle.

    The host is centos6.3, with qemu-1.5.1. 

     In the guest, I found that:

            1) All the cpu is eat by one task called "system interrupt";

            2) The virtio net device and USB Universal Host Controller share the same IRQ 5;

            3) the cpu's consumption will descend to 0% when I disable the USB Universal Host Contoller.

       Could you help to told me what's the matter and how to resolve it? Thank you very much.