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Date: Tue, 06 Nov 2012 23:05:55 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] usb: Move interrupt handling from poll to async
	handling
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To: Hans de Goede <hdegoede@redhat.com>
Cc: qemu-devel@nongnu.org

On 11/06/12 15:08, Hans de Goede wrote:
> This patchsets move interrupt handling for usb-redir and usb-hid devices
> over from polling to async handling. Together with a patch to allow
> async stepdown in ehci when the periodic schedule only contains interrupt
> queues, and a patch to allow usb-hid devices to connect to ehci, this
> fixes the usb-tablet causing a crazy cpu load for idle guests.
> 
> With this patchset the cpuload for a fully idle vm with usb-tablet
> is lowered from 20% to 2-3% (on my laptop).

Not looked at it (yet) in detail, just merged quickly into a test
branch, then found it blowing up in an assert with a win7 guest when
moving the mouse for the first time after boot.  So something is fishy
in the hid patches I guess ...

cheers,
  Gerd