On Fri, Oct 24, 2014 at 03:39:52PM +0200, Alexandre DERUMIER wrote: > >>Regarding Ceph, do you know why it burns a lot of CPU? > > I'm currently doing some perfs to find why is so huge. > > One thing is that qemu+ qemu rbd block driver + librbd seem to use 2-3x more > cpu, than passing krbd /dev/rbd0 from host to qemu. > Don't known yet if the problem is librbd or qemu rbd block driver.
That's very interesting! Please keep Josh and me in CC when you want to discuss the results. Stefan
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