SBJCN_RING_SIZE
u_int sbjcn_rbuf_size = SBJCN_RING_SIZE;
u_int sbjcn_rbuf_hiwat = (SBJCN_RING_SIZE * 1) / 4;
u_int sbjcn_rbuf_lowat = (SBJCN_RING_SIZE * 3) / 4;