--
[1]
queue = b'nvme0q1'
     usecs               : count     distribution
         0 -> 1          : 7310 |****************************************|
         2 -> 3          : 11       |      |
         4 -> 7          : 10       |      |
         8 -> 15         : 20       |      |
        16 -> 31         : 0        |      |
        32 -> 63         : 0        |      |
        64 -> 127        : 1        |      |

[2]
queue = b'nvme0q1'
     usecs               : count     distribution
         0 -> 1          : 7309 |****************************************|
         2 -> 3          : 14       |      |
         4 -> 7          : 7        |      |
         8 -> 15         : 17       |      |

Rrr, email made the histograms look funky (tabs vs. spaces...)
The count is what's important anyways...

Just adding that I used an Intel P3500 nvme device.

We can see that most of the time our latency is pretty good (<1ns) but with
huge tail latencies (some 8-15 ns and even one in 32-63 ns).

Obviously is micro-seconds and not nano-seconds (I wish...)