K 10
svn:author
V 5
sephe
K 8
svn:date
V 27
2016-04-11T06:31:52.720049Z
K 7
svn:log
V 330
hyperv/hn: Cap default # of rings to 8.

8 gives the best performance in both Azure and local Hyper-V on both
10Ge and 40Ge. More rings are still allowed by manual configuration.

Reviewed by:	Dexuan Cui <decui microsoft com>
MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D5879

END