Hi,
I have a server using its 4 physical network interfaces
bonded, with the bonding interface added to a bridge. The
bridge has the IP, and three VMs are using the bridge. Two
of the VMs are running Debian, one is running Windoze 7.
CPU load caused by the qemu-kvm processes is way higher than
I´m happy with. One of the Debian machine causes around
22% while it´s basically idle, the other one is around 3%,
and the Windoze one is around 50. They are all mostly idle.
I can observe that when some network traffic is going on with
the Windoze machine, it causes a CPU load of 200%. "Some network
traffic" means that virt-top is showing 1M/2M RX/TX. Considering
that the bonding interface is theoretically capable of handling
4Gbit full duplex, the 3Mbit are neglectable. Virtio drivers are
being used.
Currently, virt-top shows 1.9% CPU for the Windoze machine and top
shows 22% CPU load for the corresponding qemu-kvm process. There
is almost not network traffic. The VM has 4 CPUs assigned.
What may cause the high CPU load? Something must be seriously
wrong for an idle machine causing 22% CPU load and for the
same machine, still basically idle, with a some network traffic
to cause 200% CPU load on a Xeon 5690.
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