[Qemu-devel] USB Host Asynchronous I/O (Linux)

[Lonnie Mendez]

  Hi.  The attached patch allows qemu to dispatch usb data packets
asynchronously.

  The uhci controller gives poor performance with this patch.  It was
said on irc that allowing the uhci controller several pending requests
would improve this.  However the ohci controller performs very well
as-is.  The tested guests included windows xp and linux 2.6.  Both were
noticeably more responsive - cases included transfering files from a
flash drive attached to the host, using an interrupt endpoint based gps
device, and using a usb scanner to scan a few images.  There might be a
race condition for scheduling bh's from the signal handler.

qemu-usb-host-async.patch
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