I have 3 dvd units, all SATA. Reading speed decreases to ~ 1/6 once I start reading on two devices simulteneously. I'm happy to debug it, I am writing here to ask if there's already existing knowledge for the why. It might be a kernel issue, or I can imagine some cdrdao specific aggressive withdrawing logic, etc. I am specifying the device to all processes as /dev/sr?. System is ubuntu linux, recent (12.10), with unity (the Do Nothing is selected for what to do with audio CD, but that doesn't mean it doesn't touch the device at all...)
If there's something you already know about it, I appreciate it if you post it to the comments, otherwise I'll look into it. Thx!
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