On Thu, 21 Jul 2011, Sarah Sharp wrote: > > As has been pointed out repeatedly, the EHCI periodic scheduling code > > is full of bugs. No doubt you are running across some of them. > > Yes, that was my intent. :) I was trying to make sure that it was an > over-subscribed bus by verifying that the EHCI driver had issues with > scheduling. Of course, that's not a true test, because the scheduler > could have bugs with nearly over-subscribed schedules, but it was a > close enough approximation for me. Um. I certainly wouldn't assume the bus was really over-subscribed merely because there were errors. In fact, the scheduler has bugs with schedules that aren't anywhere close to being over-subscribed. For example, I have heard (though I haven't checked it personally) that ehci-hcd won't accept a full-speed isochronous endpoint with maxpacket = 1023 even if nothing else is plugged in. > Ah, ok, I hadn't noticed that. Still, I think I want to make xHCI keep > a copy of the information, at least at for a first pass. Any objections > before I send this off to Greg? No objections. 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
