On Wed, Dec 22, 2010 at 10:17:59AM +0800, loody wrote:
> Dear all:
> I found something interesting.
> I use usb_control_message to send 2000 vendor specific setup token to
> device, the speed of each return is quite slow.
> But if I just add "printk(".");" each time before I call
> usb_control_message, the speed of each return will be faster.
Really? You see this on the wire, or when running usbmon?
> I know there is a wait complete in usb_control_message, does that mean
> the printk will fasten the reaction time of wait complete?
It should not matter at all.
thanks,
greg k-h
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