D21512.diff
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	Index: head/sys/netinet/tcp_stacks/rack.c
	===================================================================
	--- head/sys/netinet/tcp_stacks/rack.c
	+++ head/sys/netinet/tcp_stacks/rack.c
	@@ -1790,6 +1790,11 @@
	*/
	tcp_update_sack_list(tp, th->th_seq,
	th->th_seq + todrop);
	+ /*
	+ * ACK now, as the next in-sequence segment
	+ * will clear the DSACK block again
	+ */
	+ tp->t_flags \|= TF_ACKNOW;
	}
	drop_hdrlen += todrop; / drop from the top afterwards */
	th->th_seq += todrop;
	@@ -2338,7 +2343,7 @@
	}
	hpts_timeout = rack_timer_start(tp, rack, cts);
	if (tp->t_flags & TF_DELACK) {
	- delayed_ack = tcp_delacktime;
	+ delayed_ack = TICKS_2_MSEC(tcp_delacktime);
	rack->r_ctl.rc_hpts_flags \|= PACE_TMR_DELACK;
	}
	if (delayed_ack && ((hpts_timeout == 0) \|\|