>> 1.) th osd bench shows 150MB/s per osd >> 2.) iperf shows constant 930Mbit/s per eth >> 3.) when i write 16GB with dd to the ceph mount i see spikes to 450Mbit/ and >> drops to 90kb/s for long periods of time. The overall dd speed is then >> 40Mbit/s > > We were doing some btrfs performance testing this week and seeing similar > bursty behavior. (See my May 7th performance on btrfs email for some > out-of-context detail.) It currently looks like the workload we're > presenting to the fs is resulting in non-optimal writeout, but we haven't > figured out yet how we can improve that or nailed down the source for the > burstiness. How that some of the inktank launch stuff is out of the way > we'll be picking it up again and continuing to work on that this week. > > If you're interested in getting involved, ping nhm in #ceph. It would be > interesting to capture a block trace from your environment and see if > what you're seeing is what we're seeing! Thank for your information - we've holdays in germany from thursday on and i won't be available. So thanks for the offer. But if you want i can provide a trace. Just tell me how i can produce one. Thanks! Stefan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
