Hi, On Tue, May 11, 2010 at 10:20:54AM -0400, Alan Stern wrote: > > I'm trying to optimize the MUSB driver as much as I can and I believe I > > got to its limit. Currently I'm getting: just noticed I forgot to put what I was getting. It was 30.42 MB/sec > The host controller driver and hardware. I came to my attention that intel's EHCI can only do 8 bulk out transactions per uframe and 11 bulk IN transactions per uframe. Do you know about that ? Have you heard it ? Could someone from Intel answer too ?? > That should allow you to achieve the maximum possible speed of the > driver and hardware. later I tested on a MacBook Pro which, aparently, has an NVidia chipset and I could get 11 bulk out transactions per uframe and that summed up to 35.48 MB/s. The only I could do to improve that is increase libusb 16KB limitation to e.g. 64KB and see if that helps. Other than that, I think I'm pretty much reaching the hardware limitation. -- balbi -- 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
