On 03/02/2010 11:34 AM, Jernej Simončič wrote:
On Tuesday, March 2, 2010, 9:21:18, Chris Webb wrote:
I remember about a year ago, someone asserting on the list that -usbdevice
tablet was very CPU intensive even when not in use, and should be avoided if
mouse support wasn't needed, e.g. on non-graphical VMs. Was that actually a
significant hit, and is it still true today?
It would appear that this is still the case, at least on slower hosts
- on Atom Z530 (1,6GHz), the XP VM uses ~30% CPU when idle with
-usbdevice tablet, but only ~4% without it. However, on a faster host
(Core2 Quad 2,66GHz), there's practically no difference (Vista x64 VM
uses ~1% CPU when idle regardless of -usbdevice tablet).
Looks like the tablet is set to 100 Hz polling rate. We may be able to
get away with 30 Hz or even less (ep_bInterval, in ms, in hw/usb-wacom.c).
--
error compiling committee.c: too many arguments to function
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