On Sat, Aug 22, 2020 at 02:03:02PM -0700, yunhua li wrote: > Thanks, Alan, your answers are really helpful. > one more question: > > It depends on what other devices are attached to the USB bus. They may > > or may not require some reserved bandwidth. > Is there any tool/method I can dump reserved or allocated bandwidth > info of each USB device? You can run "lsusb -v" and you can examine the contents of /sys/kernel/debug/usb/devices. There's more information available under /sys/kernel/debug/usb/xhci/* but I don't know what the format is or if it includes bandwidth reservations. Alan Stern
