> 1) If you've not already done so, recompile your kernel with the PREEMPT flagrunning 2.6.14-rt22 > 2) change the PCI bus latency of your IEEE controller (let me insist: this may> be a +real+ bottleneck; an evidence that you've got such a bottleneck there> is the occurence of tons of "IEC61883C: possible raw1394 error" messages when> jackd is running...).Thanks a lot for this hint. I had tons of such messages. Now, most are gone. > ("-n -20" sets the lower possible nice value for jackd).> This leads to ~11ms as reported by jdelay.Comfirmed. The bad thing is, sometimes delay increases with each xrun,but it's purely freebob issues. > And if you're interested, I can send you my edirolFA66.xml; this avoids> running the freebob daemon (in this case,I'd be very grateful, if you can. > Note also that i run everything as root. Surely, this is not good practice,I use rtlimits Thank you a lot.You helped me to overcome my frustration. Best regards, Dmitry.