CBSIZE           2037 kern/tty.c     	tp->t_hiwat = roundup(x, CBSIZE);
CBSIZE            157 net/if_sl.c    #define	SLIP_HIWAT	roundup(50,CBSIZE)
CBSIZE            198 net/if_strip.c #define	SLIP_HIWAT	roundup(50,CBSIZE)
CBSIZE            171 sys/tty.h      #define	TTMAXHIWAT	roundup(2048, CBSIZE)
CBSIZE            172 sys/tty.h      #define	TTMINHIWAT	roundup(100, CBSIZE)