On Mi, 2014-03-26 at 11:57 +0800, arei.gong...@huawei.com wrote: > From: Gonglei <arei.gong...@huawei.com> > > UHCI emulation polls the device at a freq of 1000HZ, which consumes > 12~13% CPU even though a Windows guest is completely idle when the guest > was configed usb1.1 tablet devcie. This solution counts accumulated NAK > packets. when it reaches to 64, then the guest is supposed to be idle > and the freq is lowered to 10HZ. > > This patch has been tested on Win7/WinXP/Win2008 guests, that reduces > the CPU consume from 12~13% to 6~7%.
Which qemu version did you test with? With any 2.0 release candidate windows guests should suspend the usb-tablet. And possibly stop all usb polling done by the uhci controller in case the tables is the only device connected. So this should not be needed any more. cheers, Gerd
