> > ./x86_64-softmmu/qemu-system-x86_64 -smp sockets=1,cores=2 -m 512 - > hda > > debian-squeeze-netinst.raw -netdev > > type=tap,id=net0,ifname=tap111i0,vhost=on -device > > virtio-net-pci,netdev=net0,id=net0 > > > > Downloading a larger file with wget inside the guest will show the problem. > Speed drops from 100MB/s to 15MB/s. > > > > Can someone reproduce that bug? Any ideas how to fix that? > > Which exact QEMU are you using: qemu or qemu-kvm? Distro package or > from source? Any patches applied?
I just tested with latest sources from git://git.qemu-project.org/qemu.git ./x86_64-softmmu/qemu-system-x86_64 -smp sockets=1,cores=2 -m 512 -hda debian-squeeze-netinst.raw -netdev type=tap,id=net0,ifname=tap111i0,vhost=on -device virtio-net-pci,netdev=net0,id=net0 --enable-kvm got incredible bad performance - can't you reproduce the problem?