CephFS. 8 core atom C2758, 16 GB ram, 256GB ssd, 2.5 GB NIC (supermicro microblade node). Read test: dd if=/ceph/1GB.test of=/dev/null bs=1M Write dd if=/dev/zero of=/ceph/out.test bs=1M count=1024 The tests are identical on both kernels - the results... well that is a different story. CEPH servers are on release 12.2.4 Client updated to 12.2.5 - in both kernels, ceph client is 12.2.5 Please excuse any typos. Autocorrect is evil! > On May 16, 2018, at 14:18, Jason Dillaman <jdillama@xxxxxxxxxx> wrote: > > What is your client (librbd, krbd, CephFS, ceph-client, ...) and how > are you testing performance? > > On Wed, May 16, 2018 at 11:14 AM, Donald "Mac" McCarthy > <mac@xxxxxxxxxxxxxxx> wrote: >> Recently upgraded a CEPH client to CentOS 7.5. Upon doing so read and write performance became intolerably slow. ~2.5 MB/s. When booted back to a CentOS 7.4 kernel, performance went back to a normal 200 MB/s read and write. I have not seen any mention of this issue in all of the normal places including here. For now the solution is clear - don’t use the 7.5 update. Has anyone else experienced this issue? >> >> Please excuse any typos. Autocorrect is evil! >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > -- > Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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