> -----Original Message----- > From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel- > owner@xxxxxxxxxxxxxxx] On Behalf Of Deneau, Tom > Sent: Friday, May 29, 2015 1:10 AM > To: ceph-devel > Subject: rados bench throughput with no disk or network activity > > I've noticed that > * with a single node cluster with 4 osds > * and running rados bench rand on that same node so no network traffic > * with a number of objects small enough so that everything is in the cache > so no disk traffic > > we still peak out at about 1600 MB/sec. > > And the cpu is 40% idle. (and a good chunk of the cpu activity is the rados > benchmark itself) > > What is likely causing the throttling here? You may want to try this: https://github.com/ceph/ceph/pull/4690 This one will help too: https://github.com/ceph/ceph/pull/4728 I ran into similar problem (rados bench peaking at 2300MB/s when no rados i/o was taking place; in fact, I ripped out every call to librados in the benchmark loop) and those two were solutions for me. With best regards / Pozdrawiam Piotr Dałek -- 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
