Slow networking speeds with Freebsd 12.0 and Xen-4.12.1, freebsd-12.0 as dom0

[Brian Buhrow]

	hello.  Ok.  Perhaps I spoke too soon!  the domu I was testing with,
which is an entirely pv guest, performs fine with FreeBSD.  However, if I
take an hvm guest and run that using Intel E1000 emulation, my performance
drops back to 70 mbits/sec or so of throughput.  For HVM guests, what kind
of network performance should I expect?  I've been running pv guests for
years, but don't have much experience with hvm guests.  
-thanks