MFNetBSD:

MFNetBSD:
    revision 1.50
    date: 2001/04/12 01:18:24;  author: thorpej;  state: Exp;  lines: +6 -2
    Only if __HAVE_GENERIC_SOFT_INTERRUPTS is then splusb == splsoftnet
    (because we register the interrupt with IPL_SOFTNET).  However, if
    we're using a callout, then splusb == splsoftclock (because the
    callouts happen from the softclock interrupt).

    Note that splsoftnet blocks softclock interrupts, but this is
    meant to better describe what's going on.