On 12/27/2014 05:33 PM, Jorge Ramirez-Ortiz wrote: > Hi Ricardo/all > > I finally got around to capture a trace of a SS bulk transfer using the > net2280. > The trace is available to anyone interested (70 MB file for the Beaglebone > 5000). > > We dont seem to be able to achieve transfer speeds above the 1 Gbps is because > consistently every 580usecs, 60usecs are spent doing a LUP/LDN sequence - it > seems the host stops transferring. > This sequence is triggered after 18usecs of inactivity in the bus.
my mistake: the LUP/LDN is following the spec and triggering after 10usecs of no bus activity. > > So I am guessing that enabling the scatter dma wont have much of an impact to > the overall performance. > I am reading the device spec in case I can find anything but could this be an > issue in the host controller code? > > thanks > Jorge > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
