On Wed, 16 Jun 2010, Oliver Neukum wrote: > Am Dienstag, 15. Juni 2010 04:47:06 schrieb David Brownell: > > > Unfortunately we cannot > > > scatter/gather that size. > > > > I have no idea what you mean by that. There > > is absolutely no problem building EHCI, OHCI, > > or UHCI DMA queues from lots of 2KB packets. > > (Or smaller; or larger). The hardware handles > > that just fine. That's "scatter/gather" by one > > of the common definitions of that term... > > So to make sure I got you right. The problem seems > to me that for the scatter/gather as storage does the > chunks need to be a multiple of the transfer size. > > If we want to do this for networking we'd need to align > the skbs to that size and build a virtual large package > from a chain of skbs. Is that what you had in mind? It looks like Dave meant that you can submit a large number of URBs, each transferring an arbitrary amount of data. Alan Stern -- 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
