Ideas how to improve disk performance?

but the software-bugs and hardware-incompatibilitys are fixed after all?
Or can you still enable secret ancient kernel features that cause bad things?

I am not aware of any work that would reduce interactions between NCQ and the deadline scheduler. That obviously doesn’t mean it hasn’t been fixed. If it was fixed though, there would probably be posts of LWN, Phoronix and other kernel news sites. I couldn’t find any.

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