Re: [Qemu-devel] Performance of usb tablet over ehci

[Hao Luo]

Gerd,

 

Thanks very much.

 

I tried to install usb 3.0 driver in win7 guest, and the cpu load decreased to about 9%, as much as PS2 mouse emulation.

 

BTW, there are >90 fds polled by qemu_iohandler_poll(). According to the perf profiling report, when uhci hid mouse is enabled, this function will be called much more frequently than using PS2 mouse. Any source code or functions I should refer to so that I can find out which fds take most of CPU time? 

 

2012-12-20

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Hao Luo

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发件人：Gerd Hoffmann

发送时间：2012-12-13 23:32

主题：Re: [Qemu-devel] Performance of usb tablet over ehci

收件人："luo_brian"<address@hidden>

抄送："Hans de Goede"<address@hidden>,"qemu-devel"<address@hidden>

 

On 12/13/12 16:25, luo_brian wrote: 

> I was using win7 32bit, and configured usb controller nec-xhci as 

> well as usb tablet emulation. But it didn't work. Seems usb tablet 

> failed to connect to xhci controller. 

 

win7 doesn't ship with a xhci driver (win8 does). 

 

cheers, 

  Gerd