You'll need to provide more data about how your test is configured and run for us to have a good idea. IIRC librbd is often faster than krbd because it can support newer features and things, but krbd may have less overhead and is not dependent on the VM's driver configuration in QEMU...
On Thu, Nov 15, 2018 at 8:22 AM 赵赵贺东 <zhaohedong@xxxxxxxxx> wrote:
Hi cephers,
All our cluster osds are deployed in armhf.
Could someone say something about what is the rational performance rates for librbd VS KRBD ?
Or rational performance loss range when we use librbd compare to KRBD.
I googled a lot, but I could not find a solid criterion.
In fact , it confused me for a long time.
About our tests:
In a small cluster(12 osds), 4m seq write performance for Librbd VS KRBD is about 0.89 : 1 (177MB/s : 198MB/s ).
In a big cluster (72 osds), 4m seq write performance for Librbd VS KRBD is about 0.38: 1 (420MB/s : 1080MB/s).
We expect even increase osd numbers, Librbd performance can keep being close to KRBD.
PS: Librbd performance are tested both in fio rbd engine & iscsi (tcmu+librbd).
Thanks.
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