On Sun, Sep 29, 2013 at 07:32:56PM +0200, Markus Rechberger wrote: > 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. So no test userspace program you can knock up for us? I really hate adding new core functionality to the kernel that I have no way of testing at all, that's a recipe for it quickly breaking... 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
