Apply by doing:
       cd /usr/src
       patch -p0 < 010_rtt.patch

And then rebuild your kernel.

Index: sys/netinet/tcp_input.c
===================================================================
RCS file: /cvs/src/sys/netinet/tcp_input.c,v
retrieving revision 1.175
retrieving revision 1.175.2.1
diff -u -p -r1.175 -r1.175.2.1
--- sys/netinet/tcp_input.c     16 Jul 2004 09:26:07 -0000      1.175
+++ sys/netinet/tcp_input.c     11 Jan 2005 04:36:23 -0000      1.175.2.1
@@ -2792,8 +2792,13 @@ tcp_xmit_timer(tp, rtt)
       short delta;
       short rttmin;

-       tcpstat.tcps_rttupdated++;
       --rtt;
+       if (rtt < 0)
+               rtt = 0;
+       if (rtt > TCP_RTT_MAX)
+               rtt = TCP_RTT_MAX;
+
+       tcpstat.tcps_rttupdated++;
       if (tp->t_srtt != 0) {
               /*
                * srtt is stored as fixed point with 3 bits after the
Index: sys/netinet/tcp_var.h
===================================================================
RCS file: /cvs/src/sys/netinet/tcp_var.h,v
retrieving revision 1.65
retrieving revision 1.65.2.1
diff -u -p -r1.65 -r1.65.2.1
--- sys/netinet/tcp_var.h       15 Jul 2004 15:27:22 -0000      1.65
+++ sys/netinet/tcp_var.h       11 Jan 2005 04:36:24 -0000      1.65.2.1
@@ -325,6 +325,7 @@ tcp_reass_unlock(struct tcpcb *tp)
#define        TCP_RTT_SHIFT           3       /* shift for srtt; 3 bits frac. */
#define        TCP_RTTVAR_SCALE        4       /* multiplier for rttvar; 2 bits */
#define        TCP_RTTVAR_SHIFT        2       /* multiplier for rttvar; 2 bits */
+#define TCP_RTT_MAX            (1<<9)  /* maximum rtt */

/*
 * The initial retransmission should happen at rtt + 4 * rttvar.

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