On 22.11.2009 10:47 Hans Petter Selasky wrote: > Other operating systems do a port bus reset when the device has a problem. On > FreeBSD we just try a software reset via the control endpoint. I guess that > it > is a device problem you are seeing. The USB stack in FreeBSD is faster than > the old one, and maybe the faster queueing of mass storage requests trigger > some hidden bugs in your device. > > When the problem happens try: > > sysctl hw.usb.umass.debug=-1
I have observed USB lock-ups with several external drive enclosures that used to work with the old USB stack (and continue to work when connected to a Windows notebook, for example). (BTW: System is AMD X2 with Nvidia chip-set and i386 kernel.) In my case, hw.usb.debug=6 makes the drive work at some 4MB/s for any amount of data transfered, while hw.usb.debug=5 (and an ylower value) lets the drive pause for about 1 Minute per 100MB transfered. I wanted to test whether short delays inserted in the places with DPRINTFN(6, ...) make a difference, but will not get to it before the weekend. Regards, STefan _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
