Function should_backoff

freebsd/netinet/cc/cc_hd.c:106–123

* Hamilton backoff function. Returns 1 if we should backoff or 0 otherwise. */

 * Hamilton backoff function. Returns 1 if we should backoff or 0 otherwise.
 */
static __inline int
should_backoff(int qdly, int maxqdly)
{
	unsigned long p;

	if (qdly < V_hd_qthresh) {
		p = (((RANDOM_MAX / 100) * V_hd_pmax) /
		    (V_hd_qthresh - V_hd_qmin)) * (qdly - V_hd_qmin);
	} else {
		if (qdly > V_hd_qthresh)
			p = (((RANDOM_MAX / 100) * V_hd_pmax) /
			    (maxqdly - V_hd_qthresh)) * (maxqdly - qdly);
		else
			p = (RANDOM_MAX / 100) * V_hd_pmax;
	}

	return (random() < p);
}

/*
 * If the ack type is CC_ACK, and the inferred queueing delay is greater than