>> I think there is some misunderstanding. Let me repeat in a different >> way. >> >> The smoother works perfectly (both for timer-based scheduling and for >> the needs of your module) on non-batch cards. >> >> But, even for batch cards, where timer-based scheduling is disabled, >> the smoother is active and is actually used for reporting the latency >> to your module. An attempt to use the smoother for timer-based >> scheduling on batch cards has failed. That's why I suspect that it, >> on batch cards, also tells lies to your module. > > OK, understood. I don't have anything to test it though Mh, are my USB devices batch cards? I just noticed it says "Disabling timer scheduling because BATCH flag is set" in the log and I am not sure, what a batch card is.