On Thu, Sep 26, 2013 at 2:13 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Sep 24, 2013 at 09:12:39PM +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. > > Does libusb support this? > >> The CPU usage decreases 1-2% on my 1.3ghz U7300 notebook when >> transferring 20mbyte/sec, it should be more interesting to see those >> statistics on embedded systems where copying data is more expensive. > > Any chance you could test this on a system with a "smaller" processor to > see if that really is the case or not? > just tested it on an Acer Aspire One Netbook. Intel Atom N270 1.6ghz, but running at 800mhz. The CPU Usage went down from 24% to 14-18% (transferring 20Mbyte/sec) Markus -- 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
