Understanding bandwidth results

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Hi,

In fio output, I see two values for bandwidth that I'd expect to be
the same, but that are different. For example, in the results from a
sync randread fileio test:

read : io=182811KB, bw=18279KB/s, iops=18279, runt= 10001msec
...
    bw (KB  /s): min=  966, max=21410, per=99.59%, avg=18204.94, stdev=5773.57


I realize they are close, but why are the values for bw= and avg= not
the same? I want to make sure I understand if these are not actually
reporting on the same statistic.

Also, why is per= not 100%, if this job was run with only a single
thread in a single group?

Thanks.
Andy
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