On Wed, Mar 7, 2012 at 4:32 PM, Dmitry Fleytman <dmitry.fleyt...@ravellosystems.com> wrote: > It looks like there is a problem in QEMU related to usage of frontends > without virtio extensions. > > Normally on RX path QEMU receives packet metadata with offloads > information in virtio header.
Have you tried -netdev tap,vnet_hdr=off ? I guess the tricky thing is negotiating whether or not to enable the host IFF_VNET_HDR flag. (Especially with the QEMU "vlan" feature where the tap isn't peered directly with another device.) Stefan
