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Date: Wed, 12 Dec 2012 09:29:20 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Performance of usb tablet over ehci
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To: Hans de Goede <hdegoede@redhat.com>
Cc: luo_brian <luo_brian@126.com>, qemu-devel@nongnu.org

  Hi,

> In the end the problem stays that usb uses a polling model versus the
> async interrupt model ps2 uses.

If your guest supports usb 3.0 (aka xhci) you can try that.  The
hardware design allows to not poll in the emulation, which brings down
the cpu load even more, should come pretty close to ps/2 mouse levels.

cheers,
  Gerd