Other ms/o in iostat - devstat - DSM_MS_PER_TRANSACTION_OTHER

hi all,

trying to figure out what 'ms/o' means in the iostat output

```
device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen %b
ada0 0 10 0.0 79.0 0 0 95 50 0 103
ada1 0 7 0.0 55.3 0 1 43 25 0 43
```

from man,
ms/r average duration of read transactions, in milliseconds
ms/w average duration of write transactions, in milliseconds
ms/o average duration of all other transactions, in milliseconds

from the source it looks to pull that info from devstat, in the format of DSM_MS_PER_TRANSACTION_OTHER
but there's no info of what that actually is

anyone knows what sort of IO operations 'ms/o' is measuring?
 
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