Johannes Erdfelt wrote: > > On Tue, Feb 12, 2002, Gunther Mayer <[EMAIL PROTECTED]> wrote: > > Greg KH wrote: > > > > > > On Sun, Feb 10, 2002 at 11:10:07AM +0100, Gunther Mayer wrote: > > > > Hi, > > > > 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 should be fixed in the latest 2.4.18-pre patches. Can you grab the > > > latest one, and let us know if you still have the same problems with the > > > uhci driver? > > > > > > 2.4.18pre9 breaks "libusb-0.1.4" and so my application: > > > > mc:~/libusb-0.1.4/tests # ./testlibusb > > bus/device idVendor/idProduct > > bus=0x8049de8 dev=0x1029 > > 001 > > Segmentation fault (core dumped) > > > > I added some printks, the "dev" pointer seems buggy. > > You should be using 0.1.5. There are some bugs in 0.1.4
Thanks, libusb-0.1.5 is working fine with linux-2.4.18pre9 and merlin670.c The results are about the same as linux-2.4.17 + libusb-0.1.5: uhci: 135 sec. (the scanner has to stop and restart often) usb-uhci: 43 sec. (the scanner stops about four times) usb-ohci: 37 sec. (the scanner never stops! aka "streams") To "stream", a datarate of 375KBytes/sec is needed; only usb-ohci delivers this rate; usb-uhci is acceptable; uhci is broken performance-wise. _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
