D42845.diff
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	diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4
	--- a/share/man/man4/tcp.4
	+++ b/share/man/man4/tcp.4
	@@ -31,7 +31,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd November 17, 2023
	+.Dd November 30, 2023
	.Dt TCP 4
	.Os
	.Sh NAME
	@@ -465,7 +465,7 @@
	.It Va delayed_ack
	Delay ACK to try and piggyback it onto a data packet or another ACK.
	.It Va do_lrd
	-Enable Lost Retransmission Detection for SACK-enabled sessions, disabled by
	+Enable Lost Retransmission Detection for SACK-enabled sessions, enabled by
	default.
	Under severe congestion, a retransmission can be lost which then leads to a
	mandatory Retransmission Timeout (RTO), followed by slow-start.
	diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
	--- a/sys/netinet/tcp_input.c
	+++ b/sys/netinet/tcp_input.c
	@@ -162,7 +162,7 @@
	&VNET_NAME(tcp_do_prr), 1,
	"Enable Proportional Rate Reduction per RFC 6937");

	-VNET_DEFINE(int, tcp_do_lrd) = 0;
	+VNET_DEFINE(int, tcp_do_lrd) = 1;
	SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_lrd, CTLFLAG_VNET \| CTLFLAG_RW,
	&VNET_NAME(tcp_do_lrd), 1,
	"Perform Lost Retransmission Detection");