On Thu, May 8, 2014 at 9:37 AM, Gregory Farnum <greg at inktank.com> wrote: > > Hmm, with 128 IOs at a time (I believe I'm reading that correctly?) > that's about 40ms of latency per op (for userspace RBD), which seems > awfully long. Maybe this is off the topic, AFAIK "--iodepth=128" doesn't submits 128 IOs at a time. There is a option of fio "iodepth_batch_submit=int", which defaults to 1, makes fio submit each IO as soon as it is available. See more: http://www.bluestop.org/fio/HOWTO.txt
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