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[Xen-devel] USB passthrough burning 5% of CPU?

  • To: <xen-devel@xxxxxxxxxxxxx>
  • From: Gordan Bobic <gordan@xxxxxxxxxx>
  • Date: Mon, 05 Aug 2013 13:28:39 +0100
  • Delivery-date: Mon, 05 Aug 2013 12:29:01 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

Ever since I switched from passing a PCI USB controller
through to a domU in favour of passing USB devices using
the "usbdevice" config parameter, the domU affected
seems to have qemu-dm "idling" at about 5% CPU usage in
dom0. With the PCI USB controller passed through, this
does not happen.

Is this normal/expected? Does a similar continuous CPU
overhead invisibly apply to PCI passthrough devices as
well? Or is this CPU tax only applicable to USB


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