Hi, Gunther Mayer wrote: > the "uhci" module suffers from very bad performance (linux-2.4.17). > > Scanning 150dpi A4 (merlin670 for Canon N670U over libusb-0.1.4) gives: > uhci: 135 sec. > usb-uhci: 43 sec. > ohci: 35 sec > > This corresponds to about 50K/sec for 'uhci' (and the scanner must > stop'n'start) ! > > Is this a known bug in "uhci" ?
I found something similar, with transfer rates below 100 kB/s while it was something like 700 kB/s before, resulting in heavy backtracking of the scanner head of my HP3300 scanner. I too used (a custom compiled) kernel 2.4.17, libusb 0.1.4 and uhci (compiled as module). Using the usb-uhci module instead of the uhci module solved it for me. I did not further research the issue, so I can't really tell for sure what caused the problem. Regards, Bertrik Sikken
