On Sun, 16 Jan 2005, Stephen J. Gowdy wrote: > On Sun, 16 Jan 2005, John H. wrote: > > > My usb 2.0 devices(SD card reader and usb thumb > > drive), while being listed w/usbview as 480mb/s, are > > going around 1.1 speed. > > > > ehci-hcd is loaded, what else could be the problem? > > They are just slow? What speed are you actually seeing.
Stephen is right. You have to be careful when talking about things like this. If usbview lists a device as using 480 Mb/s then that's the speed it's using. Now maybe the _throughput_ is lower than you expect -- but that's a different matter. You can also see the speed in /proc/bus/usb/devices (or wherever you have the usbfs filesystem mounted). A decrease in speed could be caused by ub device driver. Are your devices bound to usb-storage or to ub? If they are using ub then you have to disable the ub driver in the kernel configuration. > > Also, I noticed on upgrade to fc3, /proc/bus/usb was > > no longer mounted, so I added it to fstab. > > > > Do I need to? Can I just have /sys/bus/usb, which is > > up by default? > > It isn't needed for normal operations I believe, but it is very useful to > find out what is going on. I've not actually looked in /sys/bus/usb, > perhaps it is very similar? It doesn't matter where the usbfs filesystem is mounted; it will still contain the same information. However there's probably a lot of programs that expect to find it under /proc/bus/usb, so it might be a good idea to keep it there. (Unless Fedora 3 deliberately has changed things so that the programs now expect to find it under /sys/bus/usb, but I don't think they have. The kernel's usbfs driver still creates the /proc/bus/usb directory.) Alan Stern ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
