Re: [PATCHv3 0/4] qemu-kvm: vhost net support

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Aug 18, 2009 at 02:54:23PM -0600, Alex Williamson wrote:
> On Mon, Aug 17, 2009 at 6:37 AM, Michael S. Tsirkin<mst@redhat.com> wrote:
> > This adds support for vhost-net virtio kernel backend.
> >
> > This is RFC, but works without issues for me.
> 
> I got this to build by syncing up some headers in kvm/include/linux,
> but it doesn't seem to be working quite right.  I have an unused
> e1000e nic in my system (eth10,00:17:a4:77:a4:08) that I ifconfig up,
> then launch a VM with the option:
> 
> -net nic,model=virtio,macaddr=00:17:a4:77:a4:08,vhost=eth10
> 
> The virtio nic is functional in the guest, but it gets packet dupes on
> ping, which is likely contributing to the poor performance, roughly
> 1/3rd of virtio-net userspace for tcp_stream and tcp_rr.  I think I
> have all the offload option disabled on the nic in the host.  Any idea
> what I might be doing wrong?  This seems quite a bit off of the udp_rr
> results you posted.  Thanks,
> 
> Alex

Did you assign ip address in host by any chance? You don't want that.

-- 
MST