On Mon, 5 May 2008, Marti Raudsepp wrote: > On Mon, May 5, 2008 at 3:13 AM, Matthew Dharm > <mdharm-usb@xxxxxxxxxxxxxxxxxx> wrote: > > If there is no actual activity, then this is likely not a usb-storage > > problem. It may very well be an HCD problem, however. > > > > You may want to turn on CONFIG_USB_STORAGE_DEBUG and verify that there is, > > in fact, no activity to the drive during these events. > > Indeed, I enabled USB_DEBUG and USB_STORAGE_DEBUG; there are no kernel > messages at the time of the interrupt flood. > > Any ideas how to proceed to get this problem resolved? I added David > Brownell (the EHCI maintainer) to recipients. One thing you can do is to mount a debugfs filesystem, and under it go to the EHCI directory corresponding to the controller your drive is plugged into. The contents of the "registers" and "async" files would be interesting -- particularly if you get them while the disk is idle. You might even try looking at "registers" several times in a row, since its contents may change over time. Alan Stern -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
