K 10
svn:author
V 6
marius
K 8
svn:date
V 27
2016-02-04T23:56:01.092753Z
K 7
svn:log
V 297
MFC: r295133

As it turns out, one of the more or less recent changes to em(4)
causes watchdog timeouts when using TSO4 at link speeds below
Gigabit, at least with 82573E. So disable the assist automatically
when at lower speeds.

Submitted by:	jfv
Approved by:	re (kib), erj
Obtained from:	D3162

END