Hi,
I have a cluster of two kvm hosts and three ceph servers (osd+mons).
I've been doing some basic performance tests, and I discover that I
ftp server running in the guest is slow compared to a ftp server in
the host. The same with a Samba file server.
For example, ncftpget agaisnt the guest reports 42.78 MB/s and
agaisn't the host machine 98.10 MB/s. I notice the CPU load during the
transfer between the guest and the client machine. Kvm process is
eating all the CPU, 60, 70, 100 % during the transfer.
Is this a well known issue? Are there something to tune, debug?
I'm using libvirt to run the VMs, This is the disk config:
<disk type='network' device='disk'>
<driver name='qemu' type='raw'/>
<source protocol="rbd" name="libvirt01/bitt-fs01"/>
<auth username='libvirt' type='ceph'>
<secret type="ceph" uuid='e66e1ffb-2f7d-8684-727b-0512670e4aa2'/>
</auth>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</disk>
<disk type='network' device='disk'>
<driver name='qemu' type='raw'/>
<source protocol="rbd" name="libvirt01/bitt-fs01-data"/>
<auth username='libvirt' type='ceph'>
<secret type="ceph" uuid='e66e1ffb-2f7d-8684-727b-0512670e4aa2'/>
</auth>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</disk>
Regards,
Diego
--
Diego Woitasen
VHGroup - Linux and Open Source solutions architect
www.vhgroup.net
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