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When you run the gstat command on FreeBSD to get information about i/o performance, you can pass the -I (interval) option to change the default interval from 1 sec to some other time frame.

My question is, does gstat output average metrics over the interval period, or is the output just a snapshot of what going on at that moment?

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gstat show average across given interval for all metrics except L(q) (queue length). L(q) is snapshot of that moment.

In gstat the devstat_compute_statistics() is used, and this function documented in devstat(3).

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