[linux-audio-user] I/O scheduler for 2.6 kernel

Hi to the list, I've compiled a 2.6.12 kernel in my debian system (using the debian sources). I want to obtain the best latency possible without using the realtime patch. I've noted that there are three i/o scheduler in the kernel config: Device Drivers ---> Block devices ---> IO Schedulers ---> <*> Anticipatory I/O scheduler <*> Deadline I/O scheduler <*> CFQ I/O scheduler I've compiled them all as built-in. Which is best for low-latency audio work? Can I change the scheduler while the system is running (I read it somewhere)? The file /sys/block/hda/queue/scheduler contains: noop [anticipatory] deadline cfq so which scheduler am I using now? I've tried to echo cfg to that file but it remains the same. I appreciate any information, link or other to make light on the matter. Thanks for any answer, ~ Antonio