Hello,
do you have journal on disk too ?
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
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.moulin@xxxxxxx> 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.moulin@xxxxxxx
> <mailto:yoann.moulin@xxxxxxx>> 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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