D36631.1776470432.diff
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D36631.1776470432.diff
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	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
	@@ -2739,14 +2739,14 @@
	maxseg;
	/*
	* Only call tcp_output when there
	- * is new data available to be sent.
	- * Otherwise we would send pure ACKs.
	+ * is new data available to be sent
	+ * or we need to send an ACK.
	*/
	SOCKBUF_LOCK(&so->so_snd);
	avail = sbavail(&so->so_snd) -
	(tp->snd_nxt - tp->snd_una);
	SOCKBUF_UNLOCK(&so->so_snd);
	- if (avail > 0)
	+ if (avail > 0 \|\| tp->t_flags & TF_ACKNOW)
	(void) tcp_output(tp);
	sent = tp->snd_max - oldsndmax;
	if (sent > maxseg) {