Hello,
Just a quick update since I didn't have time for this yesterday.
I did a similar test as below with only the XFS node active and as expected
results are opposite:
3937 IOPS 3.16
3595 IOPS 4.9
As opposed to what I found out yesterday:
---
Thus I turned off the XFS node and ran the test
Hello,
On Thu, 16 Feb 2017 17:51:18 +0200 Kostis Fardelas wrote:
> Hello,
> we are on Debian Jessie and Hammer 0.94.9 and recently we decided to
> upgrade our kernel from 3.16 to 4.9 (jessie-backports). We experience
> the same regression but with some shiny points
Same OS, kernels and Ceph
Hello,
we are on Debian Jessie and Hammer 0.94.9 and recently we decided to
upgrade our kernel from 3.16 to 4.9 (jessie-backports). We experience
the same regression but with some shiny points
-- ceph tell osd average across the cluster --
3.16.39-1: 204MB/s
4.9.0-0: 158MB/s
-- 1 rados bench
Hello,
Finally, I found time to do some new benchmarks with the latest jewel release
(10.2.5) on 4 nodes. Each node has 10 OSDs.
I ran 2 times "ceph tell osd.* bench" over 40 OSDs, here the average speed :
4.2.0-42-generic 97.45 MB/s
4.4.0-53-generic 55.73 MB/s
4.8.15-040815-generic
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
Hello Mark,
> FWIW, on CentOS7 I actually saw a performance increase when upgrading from the
> stock 3.10 kernel to 4.4.5 with Intel P3700 NVMe devices. I was encountering
> some kind of strange concurrency/locking issues at the driver level that 4.4.5
> resolved. I think your best bet is to
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
Hello,
Am running ubuntu 16 with kernel 4.4-0.31-generic and my speed are similar.
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
Only issue am observing now with ubuntu 16 is sometime osd fails on
rebooting until
Hi Yoann,
FWIW, on CentOS7 I actually saw a performance increase when upgrading
from the stock 3.10 kernel to 4.4.5 with Intel P3700 NVMe devices. I
was encountering some kind of strange concurrency/locking issues at the
driver level that 4.4.5 resolved. I think your best bet is to try
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
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