On Thu, Dec 23, 2010 at 09:43:12PM +0800, loody wrote:
> hi:
>
> 2010/12/23 Greg KH <greg@xxxxxxxxx>:
> > 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 try to run it with usbmon, but my kernel will panic before I can
> successfully get the mon files out.
Does it panic from your driver code? I suggest posting your code here
for people to review.
> I try to cat the output of usbmon to NFS folder, but it is still empty
> after the kernel crash.
> Is there any option or config can let me flush out the content of
> usbmon immediately ?
It should always be sent out as the data is sent across the wire.
But fix your crash first, that seems like the biggest issue at the
moment.
good luck,
greg k-h
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