On Wed, 25 Aug 2010, Hans Petter Selasky wrote: > Hi, > > > > I was just concerned > > > with keeping the amount of work down, by using > > > the pre-sort (by period) and avoiding those > > > (as you say) expensive NOPs). > > Don't you use a bit-map in Linux to keep track of the free bandwidth for the > EHCI periodic activities? No, we don't. I'm not even sure how you would go about using a bitmap for such a thing. Currently the driver keeps track of the bandwidth allocated to each active periodic endpoint, and when needed it adds up the values for all the endpoints scheduled in a particular uframe. For a while I have considered switching over to storing an array of 8-bit values (the number of available microseconds in each uframe). This hasn't been implemented yet. 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
