From 84f68ed1cc044bb34284dfad2dd0358b04030f6f Mon Sep 17 00:00:00 2001
From: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Date: Thu, 4 Sep 2008 07:30:19 +0200
Subject: [PATCH] --- yaml --- r: 111535 b: refs/heads/master c:
 8b67ad12b04ef7bdf5d2b4de24fe5a609b26cf12 h: refs/heads/master i:   111533:
 344dc5d3c7b5a64eef0252b9b73e9925bbb6a5f7   111531:
 eabb3145a04439f7484392d63b95480c4a50d482   111527:
 52916a99e626d336db2ddf27a28c6e1dce7352ff   111519:
 37e66c7cd544594e9e39db934b2c0eef0d41831c v: v3

---
 [refs]                                   |  2 +-
 trunk/net/dccp/ccids/lib/tfrc_equation.c | 12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index d9c300c67481..84a9ac7687c0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d0c05fe4448db5cbdd886186860581f736f59ae9
+refs/heads/master: 8b67ad12b04ef7bdf5d2b4de24fe5a609b26cf12
diff --git a/trunk/net/dccp/ccids/lib/tfrc_equation.c b/trunk/net/dccp/ccids/lib/tfrc_equation.c
index bc3dc2b2a849..38239c4d5e14 100644
--- a/trunk/net/dccp/ccids/lib/tfrc_equation.c
+++ b/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;