On Sun, Sep 29, 2013 at 5:14 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Sun, Sep 29, 2013 at 04:02:56PM +0200, Markus Rechberger wrote: >> This patch adds memory mapping support to USBFS for isochronous and bulk >> data transfers, it allows to pre-allocate usb transfer buffers. >> >> The CPU usage decreases 1-2% on my 1.3ghz U7300 notebook >> The CPU usage decreases 6-8% on an Intel Atom n270 when >> transferring 20mbyte/sec (isochronous), it should be more interesting to >> see those >> statistics on embedded systems where copying data is more expensive. > > Do you have a userspace test program that we can use to verify that this > does work, and that others can use to run on some different platforms to > verify that this is actually faster? > You will need one of our devices for testing I guess. Some scanners (which use USBFS) or other low speed devices won't really utilize usbfs too much. I think I could provide some grabber device for testing if you want to. I don't even know another device which is transferring 20mb/sec other than our ones with USBFS. I figured out another company is doing grabber drivers in userspace for industrial cameras but that's also proprietary. Searching the kernel messages with google usually links back to our customers which are using our high speed devices. Markus > thanks, > > greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
