Bhyve: virtio-net very slow with FreeBSD 12.0 Host

[Ole]

Hello,

I discovered that virtio-net very slow with FreeBSD 12.0 Host. And with
very slow I mean 16 kBit/s.

I can't exclude that there is a problem in my setup. But I created two
very similar setups. One with FreeBSD 11.2 and one with 12.0. The server
with 11.2 has no problem.

Either I do something really wrong or there is a Bug in the virtio-net.


Both Servers are connected to a switch, the IPs of the VMs are in the vlan
4030. The Bhyve VMs are mangaed by vm-bhyve (master from github). 

Bridges are created by rc.conf:

  # Vlans
  vlans_em0="030"
  ifconfig_em0_4030="mtu 1400 up"

  # Bridges
  cloned_interfaces="bridge0"
  ifconfig_bridge0="addm em0.4030 mtu 1400 up"

switch definition:

  switch_list="vm-net"
  type_vm-net="manual"
  bridge_vm-net="bridge0"

VM config:

  loader="bhyveload"
  cpu=7
  memory=40G
  network0_type="virtio-net"
  network0_switch="vm-net"
  disk0_type="virtio-blk"
  disk0_name="disk0"
  disk0_dev="sparse-zvol"


vm creation:

  vm create -t test-host -i FreeBSD-12.0-RELEASE-amd64.raw test-example-com
  vm start test-example-com

Network setup (on the VM):

root at freebsd:~ # ifconfig vtnet0 xx.xx.xx.xx/28 mtu 1400
root at freebsd:~ # route add default yy.yy.yy.yy

could someone help me to figure out if this is a Bug, and if yes where it is?

Thanks
Ole
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