Le 23/06/2016 08:25, Sarni Sofiane a écrit : > Hi Florian, >
> On 23.06.16 06:25, "ceph-users on behalf of Florian Haas" > <ceph-users-boun...@lists.ceph.com on behalf of flor...@hastexo.com> wrote: > >> On Wed, Jun 22, 2016 at 10:56 AM, Yoann Moulin <yoann.mou...@epfl.ch> wrote: >>> Hello Florian, >>> >>>> On Tue, Jun 21, 2016 at 3:11 PM, Yoann Moulin <yoann.mou...@epfl.ch> wrote: >>>>> Hello, >>>>> >>>>> I found a performance drop between kernel 3.13.0-88 (default kernel on >>>>> Ubuntu >>>>> Trusty 14.04) and kernel 4.4.0.24.14 (default kernel on Ubuntu Xenial >>>>> 16.04) >>>>> >>>>> ceph version is Jewel (10.2.2). >>>>> All tests have been done under Ubuntu 14.04 >>>> >>>> Knowing that you also have an internalis cluster on almost identical >>>> hardware, can you please let the list know whether you see the same >>>> behavior (severely reduced throughput on a 4.4 kernel, vs. 3.13) on >>>> that cluster as well? >>> >>> ceph version is infernalis (9.2.0) >>> >>> Ceph osd Benchmark: >>> >>> Kernel 3.13.0-88-generic : ceph tell osd.ID => average ~84MB/s >>> Kernel 4.2.0-38-generic : ceph tell osd.ID => average ~90MB/s >>> Kernel 4.4.0-24-generic : ceph tell osd.ID => average ~75MB/s >>> >>> The slow down is not as much as I have with Jewel but it is still present. >> >> But this is not on precisely identical hardware, is it? > > All the benchmarks were run on strictly identical hardware setups per node. > Clusters differ slightly in sizes (infernalis vs jewel) but nodes and OSDs > are identical. One thing differ in the osd configuration, on the Jewel cluster, we have journal on disk, on the Infernalis cluster, we have journal on SSD (S3500) I can restart my test on a Jewel cluster with journal on SSD if needed. I can do as well a test on an Infernalis cluster with journal on disk. Best regards, -- Yoann Moulin EPFL IC-IT _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
