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-bounces@xxxxxxxxxxxxxx on behalf of florian@xxxxxxxxxxx> wrote: > >> On Wed, Jun 22, 2016 at 10:56 AM, Yoann Moulin <yoann.moulin@xxxxxxx> wrote: >>> Hello Florian, >>> >>>> On Tue, Jun 21, 2016 at 3:11 PM, Yoann Moulin <yoann.moulin@xxxxxxx> 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@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |