>>42
6.1では

SUPPORTED DEVICES
Device polling requires explicit modifications to the device drivers. As
of this writing, the bge(4), dc(4), em(4), fwe(4), fwip(4), fxp(4),
ixgb(4), nge(4), re(4), rl(4), sf(4), sis(4), ste(4), vge(4), vr(4), and
xl(4) devices are supported, with others in the works

ですね。