[Bug 234520] emulators/virtualbox-ose: NFS over bridged network adapter extremely slow; FreeBSD 12.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234520

            Bug ID: 234520
           Summary: emulators/virtualbox-ose: NFS over bridged network
                    adapter extremely slow; FreeBSD 12.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: d8zNeCFG at aon.at
          Assignee: vbox at FreeBSD.org
             Flags: maintainer-feedback?(vbox at FreeBSD.org)

Scenario:
- Server A:
  . running FreeBSD 12.0
  . re0: <RealTek 8168/8111 B/C/CP/D/DP/E/F/G PCIe Gigabit Ethernet>
  . providing virtual disks on ZVOLs
  . acting as VirtualBox host with virtual disks attached directly (via vmdks
pointing to the ZVOLs)
  . using bridged networking to re0
  . providing NFS storage for FreeBSD ports distfiles
- Server B:
  . running FreeBSD 12.0
  . em0: <Intel(R) PRO/1000 Network Connection>
  . acting as VirtualBox host with virtual disks attached via iSCSI from server
A
  . using bridged networking to em0
- Server C:
  . running Windows 10 Professional
  . acting as Hyper-V host with virtual disks attached via iSCSI from server A
  . using bridged networking to the LAN interface
- VirtualBox client:
  . FreeBSD 12.0 i386
  . can run on either server A, B, or C
  . Builds ports, fetching distfiles from a shared directory on host A via NFS.

Result:
- If the client is run on A or C, NFS between the client and server A runs as
usual.
- If the client is run on B (i.e., NFS is done over the wire to machine A), NFS
has extremely poor performance, to the point of no throughput at all
- The iSCSI provisioning from A for the client on B is running at normal speed
(i.e., the emulated machine itself sees normal disk performance)
- When B was still running 11.2, NFS performance was normal.

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