From: Hans de G. <hde...@re...> - 2013-07-01 14:22:49
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Hi, On 07/01/2013 04:03 PM, Alan Stern wrote: > On Mon, 1 Jul 2013, Hans de Goede wrote: > >> Hi, >> >> On 06/28/2013 09:56 PM, Doak, Roger (GE Healthcare) wrote: > >>> I can remove two of the 4 devices and the CPU utilization returns to normal: >>> Removing 2 USB devices after CPU is at 100% with 4 causes the CPU load to return to normal with testUsb only utilizing between 1.6% and 5% of the CPU. >>> So I don�t understand why CPU utilization pegs on the IMX535 with only 4 devices? >> >> I'm afraid I don't understand either, but it seems to be something outside of >> libusb, so there is little we can do from the libusb side. > > You could try looking to see how much time is spent in user mode and > how much in kernel mode. The output from strace might come in handy > here. IIRC top reported something like 95% time spend in sys rather then usr. Regards, Hans |