Alexander Motin b72a6f8a8f Re-enable write combining, disabled by default at r295486. ...

if_ntb(4) strongly benefits from WC, improving throughput from 350Mbit/s
to 8-10Gbit/s on my tests.

MFC after:	1 week

2016-05-24 12:40:03 +00:00

..

if_ntb

…

ntb_hw

…