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

[Gordan Bobic <gordan@xxxxxxxxxx>]

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
passthrough?

Gordan

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