I am afraid the most probable cause is context switching time related to your guest (or guests). On Wed, Nov 23, 2016 at 9:53 AM, M. Piscaer <debian@xxxxxxxxxxx> wrote: > Hi, > > I have an little performance problem with KVM and Ceph. > > I'm using Proxmox 4.3-10/7230e60f, with KVM version > pve-qemu-kvm_2.7.0-8. Ceph is on version jewel 10.2.3 on both the > cluster as the client (ceph-common). > > The systems are connected to the network via an 4x bonding with an total > of 4 Gb/s. > > Within an guest, > - when I do an write to I get about 10 MB/s. > - Also when I try to do an write within the guest but then directly to > ceph I get the same speed. > - But when I mount an ceph object on the Proxmox host I get about 110MB/s > > The guest is connected to interface vmbr160 → bond0.160 → bond0. > > This bridge vmbr160 has an IP address with the same subnet as the ceph > cluster with an mtu 9000. > > The KVM block device is an virtio device. > > What can I do to solve this problem? > > Kind regards, > > Michiel Piscaer > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Andrey Y Shevel _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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