Re: [libvirt-users] How can a bridge be optimized?
On Tue, Jun 12, 2012 at 03:37:00PM +0300, Henrik Ahlgren wrote:
On Mon, Jun 11, 2012 at 03:28:59PM -0400, Whit Blauvelt wrote:
> I get around 150Mb, (on a Gb interface). But then its still showing as
> "-device rtl8139" on the host. Should that be?
That clearly indicates you are not running with a virtio NIC. You
should see "-device virtio-net-pci" in the process list.
What versions of livirt and kvm/qemu are you running? What is the
guest's operating system? Does it also report rtl8139 (lshw, ethtool -i eth0)?
The host is Ubuntu 10.10 with the 2.6.35-28-server kernel. Libvirt is
0.8.3-1ubuntu19.4, qemu-kvm is 0.12.5+noroms-0ubuntu7.11. Not sure how that
relates to "Get kvm version >= 60" (from
http://www.linux-kvm.org/page/Virtio)
but it's at least a "Kernel >= 2.6.25".
The process list shows "-device virtio-balloon-pci", so virtio is at least
partially there. But also, "-device rtl8139", so this part of the XML
appears not to be taking:
<interface type='bridge'>
<mac address='00:16:36:89:65:2e'/>
<source bridge='br0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
<model type='virtio'/>
</interface>
Even though, oddly, it's consistently 50% faster with the virtio line than
without.
The guest is running Ubuntu 11.10 with the 3.0.0-20-virtual kernel. The
guest reports:
# ethtool -i eth0
driver: 8139cp
The physical NIC is an Intel 82576 using the igb driver.
Thanks,
Whit