Paul, Okay I looked at the page you pointed me to with info about hdparm. before I changed any of the controller settings I got 21.12 MB/sec for "Timing buffered disk reads" which seems to be pretty good according to the author of the web page. After changing the settings (I/O support 32 bit, unmaskirq = on, transfer mode to UltraDMA) no change. I think my program is not adversely affected by any disk access since I always check to see when my program's callbacks are actually delivered. They seem to be accurate enough and almost never more that .02 secs later than requested. My sense is that I am writing my samples on time (as far as I can measure) and the problem happens somewhere in the chain of events *after* my program writes audio samples. Do you think the lowlatency patch might help there? Or any other ideas?
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