I've found out what's wrong.  In pppd's "wait-input" function, the
call to select() *immediately* returns 1, errno 35, with none of the
fd's set.  Errno 35 is "EAGAIN".  This is not a possible return from
select, so far as I can tell.

The result of this is that pppd eats all the cycles it can get.  This
is on NetBSD-68k -current, using the A2232 device driver. (An Amiga
multiport serial card.)  It did *not* do this with this driver, and
this card, about two weeks ago.

Any suggestions?

-s