A question about NCQ

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Hi, Tejun

Since your NCQ patches were pushed into #upstream, I decide to compare
the performance between with and without NCQ enabling.

But initial test result of running iozone with O_DIRECT option turned on
didn't show the visible performance gain with NCQ. In certain cases, NCQ
even had a worse performance than without NCQ.

So my question is in what usage case can we observe the performance gain
with NCQ?

Thanks,
Forrest
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