19  *     only every-other RTT during slow start, we increase during
20  *     every RTT during slow start, just like Reno.
27  *     minimum RTT sample observed during the last RTT to calculate
64  * end of the first RTT, because any calculation we do is using
68  * Instead we must wait until the completion of an RTT during
103 /* Do RTT sampling needed for Vegas.
105  *   o min-filter RTT samples from within an RTT to get the current
108  *   o min-filter RTT samples from a much longer window (forever for now)
119 	/* Never allow zero rtt or baseRTT */  in tcp_vegas_pkts_acked()
126 	/* Find the min RTT during the last RTT to find  in tcp_vegas_pkts_acked()
146  * until we get fresh RTT samples.  So when we
176 		/* Do the Vegas once-per-RTT cwnd adjustment. */  in tcp_vegas_cong_avoid()
179 		 * at the end of the next RTT.  in tcp_vegas_cong_avoid()
183 		/* We do the Vegas calculations only if we got enough RTT  in tcp_vegas_cong_avoid()
185 		 * at least one RTT sample that wasn't from a delayed ACK.  in tcp_vegas_cong_avoid()
187 		 * then that means we're getting only 1 ACK per RTT, which  in tcp_vegas_cong_avoid()
193 			/* We don't have enough RTT samples to do the Vegas  in tcp_vegas_cong_avoid()
198 			u32 rtt, diff;  in tcp_vegas_cong_avoid()  local
201 			/* We have enough RTT samples, so, using the Vegas  in tcp_vegas_cong_avoid()
206 			/* Pluck out the RTT we are using for the Vegas  in tcp_vegas_cong_avoid()
207 			 * calculations. This is the min RTT seen during the  in tcp_vegas_cong_avoid()
208 			 * last RTT. Taking the min filters out the effects  in tcp_vegas_cong_avoid()
212 			rtt = vegas->minRTT;  in tcp_vegas_cong_avoid()
221 			do_div(target_cwnd, rtt);  in tcp_vegas_cong_avoid()
227 			diff = tcp_snd_cwnd(tp) * (rtt-vegas->baseRTT) / vegas->baseRTT;  in tcp_vegas_cong_avoid()
281 		/* Wipe the slate clean for the next RTT. */  in tcp_vegas_cong_avoid()