---

yaml
---
r: 111535
b: refs/heads/master
c: 8b67ad1
h: refs/heads/master
i:
  111533: 344dc5d
  111531: eabb314
  111527: 52916a9
  111519: 37e66c7
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d0c05fe4448db5cbdd886186860581f736f59ae9
+refs/heads/master: 8b67ad12b04ef7bdf5d2b4de24fe5a609b26cf12

trunk/net/dccp/ccids/lib/tfrc_equation.c

@@ -632,8 +632,16 @@ u32 tfrc_calc_x(u16 s, u32 R, u32 p)
 
 	if (p <= TFRC_CALC_X_SPLIT) 		{     /* 0.0000 < p <= 0.05   */
 		if (p < TFRC_SMALLEST_P) {	      /* 0.0000 < p <  0.0001 */
-			DCCP_WARN("Value of p (%d) below resolution. "
-				  "Substituting %d\n", p, TFRC_SMALLEST_P);
+			/*
+			 * In the congestion-avoidance phase p decays towards 0
+			 * when there are no further losses, so this case is
+			 * natural. Truncating to p_min = 0.01% means that the
+			 * maximum achievable throughput is limited to about
+			 * X_calc_max = 122.4 * s/RTT (see RFC 3448, 3.1); e.g.
+			 * with s=1500 bytes, RTT=0.01 s: X_calc_max = 147 Mbps.
+			 */
+			tfrc_pr_debug("Value of p (%d) below resolution. "
+				      "Substituting %d\n", p, TFRC_SMALLEST_P);
 			index = 0;
 		} else 				      /* 0.0001 <= p <= 0.05  */
 			index =  p/TFRC_SMALLEST_P - 1;