On Tue, 16 Feb 2010, Shilimkar, Santosh wrote: > > Your original patch however kills ehci, ohci and uhci on some architectures. > Well the patch was making _ONLY_ control transfers use PIO and rest of > the transfer would still use dma. So not sure how much performance impact would > be because of that. > Another issue with that patch is there are few controllers which can't do PIO > at all and hence the patch would broke those controllers. More than "a few"! None of the EHCI, OHCI, or UHCI controllers used in Intel-compatible desktop and laptop systems can do PIO. That's what Oliver meant. 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
