On Thu, Oct 31, 2013 at 2:25 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> > What host controller driver are you using? >> >> Its the USB EHCI host in the TI DM3730, so it uses the >> drivers/usb/host/ehci-omap.c driver. > > You can find out exactly what part of the kernel is responsible for > interrupt delays by using the "irqsoff" tracer. See > Documentation/trace/ftrace.txt for details about how to use it. I captured a trace here: http://bec-systems.com/usb-trace.txt Still working to decode it -- any suggestions are welcome. Enabling irqsoff significantly slows down the system. Thanks, Cliff -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
