That's a 5% difference across five dbench runs. If it is even
statistically significant, dbench is notoriously prone to chaotic
effects (less so in 2.5) It is a long stretch to say that any
increase in dbench numbers can be generalised to "improved IO
performance" across the board.
The preempt stuff is all about *worst-case* latency. I doubt if
it shifts the average latency (which is in the 50-100 microsecond
range) by more that 50 microseconds.
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