--- /usr/src/linux-source-2.6.25/net/ipv4/tcp_htcp.c	2008-04-17 12:49:44.000000000 +1000
+++ tcp_htcp.c	2008-10-24 17:02:27.000000000 +1100
@@ -22,6 +22,10 @@
 module_param(use_bandwidth_switch, int, 0644);
 MODULE_PARM_DESC(use_bandwidth_switch, "turn on/off bandwidth switcher");
 
+static int use_adaptive_backoff __read_mostly = 1;
+module_param(use_adaptive_backoff, int, 0644);
+MODULE_PARM_DESC(use_adaptive_backoff, "turn on/off adaptive backoff");
+
 struct htcp {
 	u32	alpha;		/* Fixed point arith, << 7 */
 	u8	beta;           /* Fixed point arith, << 7 */
@@ -155,7 +159,7 @@
 		}
 	}
 
-	if (ca->modeswitch && minRTT > msecs_to_jiffies(10) && maxRTT) {
+	if (use_adaptive_backoff && ca->modeswitch && minRTT > msecs_to_jiffies(10) && maxRTT) {
 		ca->beta = (minRTT << 7) / maxRTT;
 		if (ca->beta < BETA_MIN)
 			ca->beta = BETA_MIN;