rack_increase_bw_mul
rack_increase_bw_mul(rack, -1, 0, 0, 1);
rack_increase_bw_mul(rack, -1, 0, 0, 1);
rack_increase_bw_mul(rack, -1, 0, 0, 1);
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 1);
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);
rack_increase_bw_mul(rack, timely_says, cur_bw, last_bw_est, 0);