On Fri, 2015-09-18 at 20:51 +0200, Dragan Milivojević wrote: > Update as promised: > I ran the same tests on 2 low end Centos 7.1 workstations with latest > updates applied. > I got exactly the same behaviour, increasing the iodepth has the same > effect as with previous tests. > Absolute values were about 5% lover, probably due to low end > integrated nics (RTL 8169). > Changing the mtu had no measurable effect. > > At this point I think that we can safely rule out network as a problem. > I would be grateful if anyone can replicate my results on other distributions. > At this point I'm out of ideas, maybe running blktrace on server can > provide some pointers? > > Any suggestions on how to proceed further ? > The throughput you're seeing with a single LUN + iodepth=1 + 1 Gb/sec is expected behavior. In order to saturate a 1 Gb/sec link, more outstanding I/Os need to be kept in flight (iodepth > 1) or a larger payload needs to be utilized. --nab -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
