I'm also having real good experience with Ubuntu 10.4 (slightly customized with the UStudio packages). I agree that only Firewire devices performance seems to really improve with a RT kernel.
In RT with a Ricoh chip and FFADO from svn I can have 8ms latency (I only tried using 6 channels and 8 i/o open), although I have to note that a few times with heavy load of audio streaming amongst different applications jack dies and needs to be restarted. I didn't need to set IRQ so far. In non-RT I use a edirol ua-25 which works pretty good with low latency too (but not as good as firewire rt). M -- Marco Donnarumma aka TheSAD Independent New Media Arts Professional, Performer, Teacher Ongoing MSc by Research, University of Edinburgh, UK PORTFOLIO: http://marcodonnarumma.com LAB: http://www.thesaddj.com | http://cntrl.sourceforge.net | http://www.flxer.net EVENT: http://www.liveperformersmeeting.net
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