Hi, On 11 April 2018 at 07:48, Larry Chen <lchen@xxxxxxxx> wrote: > > I referred to the docs and examples but I'm still hard to understand how to > use latency_target, latency_window and latency_percentile. > Could any one help explain it in detail? > Thanks in advance > > Sorry for that this letter might be resent to the list because my > misoperation of subscribing fio mail list. These options are used to probe the highest iodepth usable such that the I/Os still have a latency equal to or below that of latency_target on the basis that more asynchronous I/Os being sent at the same time the higher each I/Os latency will be (this is what http://fio.readthedocs.io/en/latest/fio_man.html#cmdoption-arg-latency-window is trying to say). latency_window controls the time window that I/Os are considered over. latency_percentile is used to adjust the sensitivity to outlier I/Os during this process so a single moment high spike is ignored. Any clearer? -- Sitsofe | http://sucs.org/~sits/ -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
