Hello, do you have journal on disk too ? Yes am having journal on same hard disk.
ok and could you do bench with kernel 4.2 ? just to see if you have better throughput. Thanks In ubuntu 14 I was running 4.2 kernel. the throughput was the same around 80-90MB/s per osd. I cant tell the difference because each test gives the speeds on same range. I did not test kernel 4.4 in ubuntu 14 -- Lomayani On Tue, Jul 26, 2016 at 9:39 AM, Yoann Moulin <yoann.mou...@epfl.ch> wrote: > Hello, > > > Am running ubuntu 16 with kernel 4.4-0.31-generic and my speed are > similar. > > do you have journal on disk too ? > > > I did tests on ubuntu 14 and Ubuntu 16 and the speed is similar. I have > around > > 80-90MB/s of OSD speeds in both operating systems > > ok and could you do bench with kernel 4.2 ? just to see if you have better > throughput. Thanks > > > Only issue am observing now with ubuntu 16 is sometime osd fails on > rebooting > > until i start them manually or adding starting commands in rc.local. > > in my case, it's a test environment, so I don't have notice those > behaviours > > -- > Yoann > > > On Mon, Jul 25, 2016 at 6:45 PM, Yoann Moulin <yoann.mou...@epfl.ch > > <mailto:yoann.mou...@epfl.ch>> wrote: > > > > Hello, > > > > (this is a repost, my previous message seems to be slipping under > the radar) > > > > Does anyone get a similar behaviour to the one described below ? > > > > I found a big performance drop between kernel 3.13.0-88 (default > kernel on > > Ubuntu Trusty 14.04) or kernel 4.2.0 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 on > > - Each cluster has 5 nodes strictly identical. > > - Each node has 10 OSDs. > > - Journals are on the disk. > > > > Kernel 4.4 has a drop of more than 50% compared to 4.2 > > Kernel 4.4 has a drop of 40% compared to 3.13 > > > > details below : > > > > With the 3 kernel I have the same performance on disks : > > > > Raw benchmark: > > dd if=/dev/zero of=/dev/sdX bs=1M count=1024 oflag=direct => > average ~230MB/s > > dd if=/dev/zero of=/dev/sdX bs=1G count=1 oflag=direct => > average ~220MB/s > > > > Filesystem mounted benchmark: > > dd if=/dev/zero of=/sdX1/test.img bs=1G count=1 => > average ~205MB/s > > dd if=/dev/zero of=/sdX1/test.img bs=1G count=1 oflag=direct => > average ~214MB/s > > dd if=/dev/zero of=/sdX1/test.img bs=1G count=1 oflag=sync => > average ~190MB/s > > > > Ceph osd Benchmark: > > Kernel 3.13.0-88-generic : ceph tell osd.ID bench => average ~81MB/s > > Kernel 4.2.0-38-generic : ceph tell osd.ID bench => average ~109MB/s > > Kernel 4.4.0-24-generic : ceph tell osd.ID bench => average ~50MB/s > > > > I did new benchmarks then on 3 new fresh clusters. > > > > - Each cluster has 3 nodes strictly identical. > > - Each node has 10 OSDs. > > - Journals are on the disk. > > > > bench5 : Ubuntu 14.04 / Ceph Infernalis > > bench6 : Ubuntu 14.04 / Ceph Jewel > > bench7 : Ubuntu 16.04 / Ceph jewel > > > > this is the average of 2 runs of "ceph tell osd.* bench" on each > cluster (2 x 30 > > OSDs) > > > > bench5 / 14.04 / Infernalis / kernel 3.13 : 54.35 MB/s > > bench6 / 14.04 / Jewel / kernel 3.13 : 86.47 MB/s > > > > bench5 / 14.04 / Infernalis / kernel 4.2 : 63.38 MB/s > > bench6 / 14.04 / Jewel / kernel 4.2 : 107.75 MB/s > > bench7 / 16.04 / Jewel / kernel 4.2 : 101.54 MB/s > > > > bench5 / 14.04 / Infernalis / kernel 4.4 : 53.61 MB/s > > bench6 / 14.04 / Jewel / kernel 4.4 : 65.82 MB/s > > bench7 / 16.04 / Jewel / kernel 4.4 : 61.57 MB/s > > > > If needed, I have the raw output of "ceph tell osd.* bench" > > > > Best regards >
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