> Could one give me a hint, how to create a test environment to artificially > test such a scenario? Could one be of any help whether I can simulate a usb > device in software? Realistically I doubt. I'd have thought if you want to do this seriously you want a decent performance USB board capable of being a USB device (ie using the usb-gadget code) and writing an emulation of what you want to study, then run that across two PCs The last time someone stress tested the tty core code we were doing ok with HSDPA. The newest modern hardware isn't going to use serial emulation anyway. The serial setup is brain dead especially if running in CMUX mode where you've got a serial link emulated over a multi channel packet based interface running a protocol to provide a multiple channel packet based interface each channel of which carries a serial emulation which carries an asynchronous framed PPP connection in order to map IP packets onto the emulated serial link. If it had been anyone but a telco involved someone would have shot the poor beast before it got out of the lab ! Alan -- 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