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

Alex Williamson alex.williamson at hp.com
Tue Aug 18 13:54:23 PDT 2009


On Mon, Aug 17, 2009 at 6:37 AM, Michael S. Tsirkin<mst at 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


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