On Tue, 2007-12-11 at 10:38 +0100, Jozef Henzl wrote: > Hello list, > Is it possible to prioritize irq of a usb device? I have the behringer bcr2000 > midi controller, plugged to a usb port, and i experience really heavy > latencies when cpu is on a high load (latency > 1s). During normal system > operation it's ok, latency is practically realtime. If you are running a RT patched kernel with threaded IRQ handlers you can set the priorities for the different IRQs just as for any other RT scheduled thread. One second of latency sounds a bit extreme though - are you sure the problem isn't somewhere else? --ll
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