diff --git a/share/man/man4/siftr.4 b/share/man/man4/siftr.4
--- a/share/man/man4/siftr.4
+++ b/share/man/man4/siftr.4
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 24, 2023
+.Dd April 25, 2023
 .Dt SIFTR 4
 .Os
 .Sh NAME
@@ -175,14 +175,6 @@
 .Nm .
 .El
 .Bl -tag -offset indent -width Va
-.It Va hz
-tick rate of the kernel in ticks per second.
-.El
-.Bl -tag -offset indent -width Va
-.It Va tcp_rtt_scale
-smoothed RTT estimate scaling factor.
-.El
-.Bl -tag -offset indent -width Va
 .It Va sysname
 operating system name.
 .El
@@ -294,11 +286,7 @@
 .El
 .Bl -tag -offset indent -width Va
 .It Va 17
-The current smoothed RTT estimate for the flow, in units of TCP_RTT_SCALE * HZ,
-where TCP_RTT_SCALE is a define found in tcp_var.h, and HZ is the kernel's tick
-timer.
-Divide by TCP_RTT_SCALE * HZ to get the RTT in secs.
-TCP_RTT_SCALE and HZ are reported in the enable log message.
+The current smoothed RTT estimate for the flow, in units of microsecond.
 .El
 .Bl -tag -offset indent -width Va
 .It Va 18
@@ -313,10 +301,7 @@
 .El
 .Bl -tag -offset indent -width Va
 .It Va 20
-The current retransmission timeout length for the flow, in units of HZ, where HZ
-is the kernel's tick timer.
-Divide by HZ to get the timeout length in seconds.
-HZ is reported in the enable log message.
+The current retransmission timeout length for the flow, in units microsecond.
 .El
 .Bl -tag -offset indent -width Va
 .It Va 21
diff --git a/sys/netinet/siftr.c b/sys/netinet/siftr.c
--- a/sys/netinet/siftr.c
+++ b/sys/netinet/siftr.c
@@ -207,11 +207,8 @@
 	int			conn_state;
 	/* Max Segment Size (bytes). */
 	u_int			max_seg_size;
-	/*
-	 * Smoothed RTT stored as found in the TCP control block
-	 * in units of (TCP_RTT_SCALE*hz).
-	 */
-	int			smoothed_rtt;
+	/* Smoothed RTT (usecs). */
+	uint32_t		srtt;
 	/* Is SACK enabled? */
 	u_char			sack_enabled;
 	/* Window scaling for snd window. */
@@ -220,8 +217,8 @@
 	u_char			rcv_scale;
 	/* TCP control block flags. */
 	u_int			flags;
-	/* Retransmit timeout length. */
-	int			rxt_length;
+	/* Retransmission timeout (usec). */
+	uint32_t		rto;
 	/* Size of the TCP send buffer in bytes. */
 	u_int			snd_buf_hiwater;
 	/* Current num bytes in the send socket buffer. */
@@ -453,7 +450,7 @@
 		    MAX_LOG_MSG_LEN,
 		    "%c,0x%08x,%zd.%06ld,%x:%x:%x:%x:%x:%x:%x:%x,%u,%x:%x:%x:"
 		    "%x:%x:%x:%x:%x,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,"
-		    "%u,%d,%u,%u,%u,%u,%u,%u,%u,%u\n",
+		    "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u\n",
 		    direction[pkt_node->direction],
 		    pkt_node->hash,
 		    pkt_node->tval.tv_sec,
@@ -485,10 +482,10 @@
 		    pkt_node->rcv_scale,
 		    pkt_node->conn_state,
 		    pkt_node->max_seg_size,
-		    pkt_node->smoothed_rtt,
+		    pkt_node->srtt,
 		    pkt_node->sack_enabled,
 		    pkt_node->flags,
-		    pkt_node->rxt_length,
+		    pkt_node->rto,
 		    pkt_node->snd_buf_hiwater,
 		    pkt_node->snd_buf_cc,
 		    pkt_node->rcv_buf_hiwater,
@@ -512,7 +509,7 @@
 		log_buf->ae_bytesused = snprintf(log_buf->ae_data,
 		    MAX_LOG_MSG_LEN,
 		    "%c,0x%08x,%jd.%06ld,%u.%u.%u.%u,%u,%u.%u.%u.%u,%u,%u,%u,"
-		    "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%d,%u,%u,%u,%u,%u,%u,%u,%u\n",
+		    "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u\n",
 		    direction[pkt_node->direction],
 		    pkt_node->hash,
 		    (intmax_t)pkt_node->tval.tv_sec,
@@ -536,10 +533,10 @@
 		    pkt_node->rcv_scale,
 		    pkt_node->conn_state,
 		    pkt_node->max_seg_size,
-		    pkt_node->smoothed_rtt,
+		    pkt_node->srtt,
 		    pkt_node->sack_enabled,
 		    pkt_node->flags,
-		    pkt_node->rxt_length,
+		    pkt_node->rto,
 		    pkt_node->snd_buf_hiwater,
 		    pkt_node->snd_buf_cc,
 		    pkt_node->rcv_buf_hiwater,
@@ -785,10 +782,10 @@
 	pn->rcv_scale = tp->rcv_scale;
 	pn->conn_state = tp->t_state;
 	pn->max_seg_size = tp->t_maxseg;
-	pn->smoothed_rtt = tp->t_srtt;
+	pn->srtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
 	pn->sack_enabled = (tp->t_flags & TF_SACK_PERMIT) != 0;
 	pn->flags = tp->t_flags;
-	pn->rxt_length = tp->t_rxtcur;
+	pn->rto = tp->t_rxtcur * tick;
 	pn->snd_buf_hiwater = inp->inp_socket->so_snd.sb_hiwat;
 	pn->snd_buf_cc = sbused(&inp->inp_socket->so_snd);
 	pn->rcv_buf_hiwater = inp->inp_socket->so_rcv.sb_hiwat;
@@ -1270,10 +1267,9 @@
 
 		sbuf_printf(s,
 		    "enable_time_secs=%jd\tenable_time_usecs=%06ld\t"
-		    "siftrver=%s\thz=%u\ttcp_rtt_scale=%u\tsysname=%s\t"
-		    "sysver=%u\tipmode=%u\n",
-		    (intmax_t)tval.tv_sec, tval.tv_usec, MODVERSION_STR, hz,
-		    TCP_RTT_SCALE, SYS_NAME, __FreeBSD_version, SIFTR_IPMODE);
+		    "siftrver=%s\tsysname=%s\tsysver=%u\tipmode=%u\n",
+		    (intmax_t)tval.tv_sec, tval.tv_usec, MODVERSION_STR,
+		    SYS_NAME, __FreeBSD_version, SIFTR_IPMODE);
 
 		sbuf_finish(s);
 		alq_writen(siftr_alq, sbuf_data(s), sbuf_len(s), ALQ_WAITOK);