On Sun, May 04, 2008 at 07:24:19PM +0300, Marti Raudsepp wrote: > Hello, > > [1.] One line summary of the problem: > PROBLEM: powertop reports 8000 spurious interrupts/s from USB disk > > [2.] Full description of the problem/report: > I am frequently seeing bursts of (exactly) 8000 interrupts per second > from my USB controller; it seems to be closely related to activity on > my USB hard disk, although the relation is somewhat vague. > [...] > What is obviously visible from the dstat output is that the ~8000 > interrupts keep arriving even when there is no actual activity on the > disk, and it also causes no noticeable CPU load. 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. Matt -- Matthew Dharm Home: mdharm-usb@xxxxxxxxxxxxxxxxxx Maintainer, Linux USB Mass Storage Driver I'm a pink gumdrop! How can anything be worse?!! -- Erwin User Friendly, 10/4/1998
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