i have a macbook pro with a presonus firepod (firewire) running linux with freebob (ffado is not ready). the latency testing patch in pd gives me around 12 ms, but jdelay is 7 ms. the only annoying thing with my setup is that i have to rmmod ath_pci to avoid glitches (pretty weird).
i am waiting for the first release of ffado. maybe it will fix this problem. pat