performance issue with jewel on ubuntu xenial (kernel)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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

Kernel 4.4 has a drop of 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 => average  ~81MB/s
Kernel 4.2.0-38-generic  : ceph tell osd.ID => average ~109MB/s
Kernel 4.4.0-24-generic  : ceph tell osd.ID => average  ~50MB/s

Does anyone get a similar behaviour on their cluster ?

Best regards

-- 
Yoann Moulin
EPFL IC-IT
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com



[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux